51 pages 1-hour read

The Summer Guests

Fiction | Novel | Adult | Published in 2025

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Chapters 40-50Chapter Summaries & Analyses

Content Warning: This section of the guide includes discussion of graphic violence, mental illness, substance use, illness, child abuse, and death.

Chapter 40 Summary: “Jo”

The Martini Club goes to see Jo at the police station. They tell her that they have discovered that the Conovers, the Greenes, Arthur Fox, and Vivian Stillwater all worked for a secret CIA program called MKUltra, in which the US government tested various brainwashing techniques, using drugs like LSD on its own citizens. The group moved to Maiden Pond around 1967 and tested drugs on Purity locals, including Sam Tarkin. It was one of those drugs that caused his psychotic episode in 1972. After the massacre, Dr. Greene and the Conovers arranged the settlement so that the Tarkins would not go public with what they knew. The event caused Vivian Stillwater to have a change of heart about her role in the program, and she tried to leave. To prevent her from blowing the whistle on MKUltra, she was dosed with a drug that caused her fatal accident.


Maggie speculates that the body in the pond is another victim of a coverup of the program. Initial lab results confirm that the skeleton’s dental filling dates to 1962, which would align with the timeframe. They think that Elizabeth Conover may have tried to kill Zoe when she discovered the skeleton. Ben points out that Elizabeth and Arthur with likely not talk, but he suggests the group might be able to learn something with the assistance of the hospital.

Chapter 41 Summary

Jo interviews Elizabeth, who initially denies all knowledge of MKUltra and Vivian’s death. Even when she admits that Dr. Greene drugged Vivian, she insists she had nothing to do with the body in the lake or the attempted murder of Zoe. 


Detective Alfond stops the interrogation to tell Jo that new lab analysis proves that the dental filling in the body from the lake dates to the mid-1980s or later, meaning the death would not be connected to MKUltra. The lab has created a reconstruction of what the woman would have looked like, and when Jo shows Elizabeth the image, Elizabeth pauses in a way that catches “Jo’s attention.” She thinks Elizabeth knows who the woman is. Ethan picks Elizabeth up, and they drive away from the police station.

Chapter 42 Summary: “Maggie”

Maggie and Declan follow Ethan and Elizabeth, who are driving to the hospital instead of returning home. As they drive, Jo calls Maggie and lets her know that the skeleton in the lake died sometime after the mid-1980s. Ethan drops Elizabeth off at the hospital, and Elizabeth goes into Zoe’s room. Ben monitors her on his security cameras. Maggie expects Elizabeth to try to hurt Zoe, but instead, she simply sits at her bedside.

Chapter 43 Summary: “Susan”

Susan is at home alone with Kit. She wants to return to the hospital to see Zoe, but she does not have a ride. Eventually, Colin and Brooke return. Colin asks Susan to help carry in groceries, and Susan notices that there is a small gold stud in their car’s trunk. She grabs it. She suspects it is Zoe’s earring, but she wonders if Brooke has something similar; it may be hers. As she thinks, she hears Colin’s car pulling out of the driveway. Thinking Brooke has left as well, Susan searches Brooke’s jewelry box for an earring similar to the one she found in the trunk. Brooke comes in and catches Susan going through her things.

Chapter 44 Summary: “Maggie”

The Martini Club watches on the security cameras as Colin joins Elizabeth in Zoe’s hospital room. Elizabeth tells Colin that she knows the skeleton in the pond is Anna; she recognized the facial reconstruction the lab did. Colin insists that his father, George, drove Anna to the airport. However, Colin also admits to having had an affair with Anna and reveals that Anna had gotten pregnant. Elizabeth accuses Colin of being “just like [his] father” and using murder to cover it up (289). Nevertheless, Colin insists that he did not murder Anna. Elizabeth suggests that perhaps George killed Anna to protect the family. Colin retorts that he had no reason to hurt Zoe. Then, he realizes that Brooke was there when George took Anna away, supposedly to catch a flight. Hearing this, Maggie calls Jo.

Chapter 45 Summary: “Susan”

Susan tells Brooke she was going through the jewelry box to see if the gold stud she found in the trunk belonged to Brooke. She shows Brooke the gold earring, and Brooke admits it is not hers. Susan assumes that Colin put Zoe in the trunk and threw her over the ravine. Brooke responds with apparent shock, but as Susan heads downstairs to get her cell phone and call the police, Brooke pushes her down the stairs. Susan blacks out.


When she comes to, Kit and Brooke are dragging Susan to the pond. Though Kit begs his mother not to “make [him] do this again” (294), they put Susan into the pond, and Brooke holds Susan’s head underwater. Susan attempts to fight back, but she begins to drown.

Chapter 46 Summary: “Jo”

Jo enters Moonview cottage and sees blood on the floor. Ethan arrives, panicked. He hears something down at the pond and rushes there. Jo follows. Ethan drags Susan onto the shore, and Jo administers CPR, eventually reviving Susan.


Jo goes to Brooke, who is huddled at the edge of the water, “rocking back and forth” (302). Reuben is standing over Brooke and tells Jo that he saw Brooke trying to drown Susan from across the pond. He intervened to stop Brooke. Brooke keeps saying, “[I]t’s all her fault” (302), referring to Anna. The ambulance and police backup arrive. Jo arrests Brooke.

Chapter 47 Summary: “Reuben”

Reuben’s sister, Abigail, has cancer and will likely die. Reuben takes her to the hospital for her chemotherapy, and while there, he sees Jo. Jo tells Reuben that Susan and Zoe are both still at the hospital but expected to make full recoveries. Jo also thanks Reuben for saving Susan’s life. As they talk, Ethan approaches. He, too, thanks Reuben for saving Susan’s life. Jo encourages Reuben to end the feud with the Conovers.

Chapter 48 Summary: “Maggie”

The Martini Club assembles at Maggie’s house. They are somewhat embarrassed that they became so fixated on the MKUltra angle that they missed that the skeleton in the lake and Zoe’s attempted murder were actually the result of a “small” domestic affair. They reflect that George Conover helped Brooke cover up Anna’s murder.


When Jo arrives for dinner, she comforts the group by reminding them that “this case has been one big machine with multiple moving parts” (316), which are all connected. She tells them she has been officially appointed police chief. They celebrate Jo’s official appointment and solving the case.

Chapter 49 Summary: “Susan”

Susan and Zoe stand at the edge of Maiden Pond. Zoe needs to use a walker, but she is healing well. Ethan calls them: The car is packed and they are ready to go. As they pull away, Susan and Ethan agree that they never want to see the place again.

Chapter 50 Summary: “Reuben”

Reuben notices that the “summer people” have left. He feels the weather turning colder. Paddling in his kayak to the Moonview dock, He tosses a bouquet of flowers for Anna into the pond. He imagines he can see her ghost standing there, and he waves at her before paddling back home.

Chapters 40-50 Analysis

As is typical of a murder mystery like The Summer Guests, the end of the novel resolves the central mysteries. It is established that Anna is the skeleton found in the lake and that Brooke murdered Anna and attempted to murder Zoe. Although the MKUltra angle turns out to have been a red herring—making the opening chapter deliberately misleading—the novel also provides answers to that storyline, revealing that Sam Tarkin was drugged by the Conovers and that the CIA paid the Tarkin family to cover it up. However, there are still a few loose ends that are left ambiguous, such as the identities of the suspicious-looking men that Officer Pelletier spotted in the Marigold Café shortly before Sam Tarkin’s accident. Their presence may have been another red herring, but they also could have been CIA agents, perhaps even setting up future installments in the series. 


More substantially, the relationship between Brooke and Kit Conover is never fully elucidated. Elizabeth Conover tells Susan that “The pediatricians never could pinpoint why Kit had so many digestive issues” and that Kit only improved while in the care of the nanny (203). This strongly implies that Brooke has what is known colloquially as Munchausen by proxy or clinically as factitious disorder imposed on another. Coupled with Brooke’s overbearing presence in Kit’s life, the suggestion is that Brooke made her son ill to force him to be more dependent on her. As Elizabeth notes, “[H]e’s grown so attached to his mother, I don’t know how he’ll manage going to college” (203). Though left somewhat ambiguous, this subplot relates to the novel’s interest in The Protection of Family Members and Family Loyalty, suggesting that devotion to one’s loved ones can be quite literally unhealthy. 


The Summer Guests deviates somewhat from typical murder mysteries by emphasizing that crimes are solved by teamwork rather than by a singular genius investigator. This minor motif returns in Chapter 48 when the Martini Club reflects on the mistakes they made in the investigation. As Lloyd notes, “It’s embarrassing to admit […] but we couldn’t see the forest for the trees” (311). This illustrates that, despite their many years of experience, the members of the Martini Club are not omniscient geniuses; they are human, and they make mistakes as a result of their own preconceptions. This makes them more complex characters while subtly touching on the Difference Between Appearances and Reality: Coupled with the town’s history, Zoe’s disappearance looks like a government conspiracy, particularly to those coming from a CIA background themselves. The misconception also affords the club the opportunity to discuss whether they are “slipping” due to their age, a prospect that unnerves them. This consideration of the consequences of aging further humanizes the characters while laying the groundwork for character-driven subplots in future novels.


In the final chapter of the novel, the Tensions Between Upper and Lower Classes ease somewhat when the “summer people” leave Maiden Pond, leaving Reuben to enjoy the area in peace. This chapter also deepens the theme by illustrating the class solidarity between Reuben and Anna. As two lower-income people in a world controlled by the upper classes, their friendship provided them with a sense of comfort and belonging. In contrast to the elaborate memorial ceremony for George Conover, Reuben quietly memorializes Anna in a simple way, dropping a bouquet of flowers he picked himself into the pond. Reuben also finds healing as a result of sharing the story of his family’s exploitation; since the CIA covered up this chapter in its history, merely airing it provides a measure of justice, and Reuben’s resentment abates as a result. This becomes clear when Reuben reflects that “once, Moonview’s presence on the pond had seemed like a wound that festered and never healed, but now when he looked at it, he saw a house, nothing more” (323). Reuben is moving on, just as Susan, Ethan, and Zoe heal and move on after the traumatic events of the novel.

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