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Fifth-grader Cam Jansen is the protagonist in Cam Jansen and the Mystery of the Stolen Diamonds. Her real name is Jennifer, but because of her photographic memory, people call her “the Camera.” This epithet is shortened to “Cam,” the nickname that most people use for her.
In the story, Cam is portrayed as a curious and intelligent girl who loves to test her memory. For instance, she enjoys challenging her friend Eric to memory games and drawing on her clear mental “pictures” to answer his questions. Cam uses her memory intentionally by carefully observing people and saying “click” to take a mental picture of them. This technique helps her to accurately recall the suspects of the diamond heist when she sees them again. For instance, when she sees “the Runner” again, she recognizes him right away and exclaims, “They got him! That’s the man who ran out of Parker’s. I remember that mustache, that dark suit, and that ugly green tie” (24). Cam’s memory and intense focus help her to recall important information and to act on clues. For instance, she notices the elderly women who were in the store and interviews them, comparing their story with what she saw.
However, sometimes she is so focused on solving the mystery that she does not consider the risks and consequences of her actions. For example, when she and Eric follow the thieves to their hideout, Cam does not think about the dangers of the situation until she is captured by the thieves. The author writes, “Because houses were being torn down, cars were not allowed on Minnow Road. Cam realized that she and Howie were alone. The only other people nearby were the thieves” (38). Luckily, Cam is also quick-thinking and decisive. When she is trapped in the house, she manages to evade the thieves by making it seem like she ran away, while she hides behind a bookcase. Cam’s intelligence and curiosity, as well as her impulsive personality, make her a decisive protagonist who is capable of solving even the most difficult mysteries.
Eric, Cam’s best friend, is portrayed as a friendly and responsible boy, as well as a loving older brother to baby Howie. As the eldest of four children, Eric is very experienced with taking care of babies, and his mother asks him to babysit Howie while she shops at the mall. Eric’s care for Howie shows that he is responsible and independent. He holds and feeds Howie on his own and brings him everywhere.
While Eric does not have as strong a memory as Cam does, he does demonstrate strong critical thinking skills that help him and Cam to solve the mystery together. For example, he notices the suspect that they call “the Runner” leaving the mall in a different direction. This detail makes Eric suspicious, and he tells Cam, “Before, when he was in such a rush, he went that way. […] If he was in such a hurry to get there before, you’d think he’d go back that way now” (29). This observation prompts the two friends to follow the man, and their bold actions help them to crack the case.
In the story “the Runner” is a secondary character and antagonist. He is a suspect in the robbery. When Cam and Eric watch the store while the robbery unfolds, they notice a man in a dark suit with a mustache and a green tie running out of the store and through the crowds. They nickname him “the Runner” because of his dramatic getaway.
The Runner is intimidating and grumpy. When he finds Cam and baby Howie outside, he makes them enter the house and tries to intimidate Cam. As he says, “Well. […] Look who we have here—the babysitter and her baby. Where’s your friend?” When Cam lies and claims that Eric “went home,” the man taunts her, declaring, “If you were smart you would have done the same thing. Let’s go” (41).
As a crafty thief, the runner almost tricks the police with his antics. His collaboration with the young couple shows his careful planning of the robbery. The police officer admits at the end that the trick nearly worked. As he says, “Those thieves had us baffled…we chased the one man who ran” (55). The runner’s dishonest behavior makes him a foil to Cam and Eric, who act with both innocence and heroism.
The young couple are secondary characters and antagonists. They are portrayed as suspicious because of their behavior after the robbery. Cam and Eric notice them leaving the store with a baby and a large rattle. The author writes, “The man was wearing a dark suit. He was tall, and so was the woman with him. She was holding what looked like a baby, wrapped in a pink blanket” (10). The children consider the couple “strange” as they notice that the pair had no baby supplies, only the rattle, and are in a rush to leave the store. Eric considers the idea that this man could be the suspect the police are looking for. He comments to Cam, “There was another man who left the store, the man with the baby” (27). The kids’ hunch is correct, as the couple are really thieves and their “baby” is actually a doll.
While they are both flat characters, they are portrayed as mean, greedy people who just want to escape with their stolen diamonds. The illustration shows them frowning angrily as they demand to know where Eric is. Cam overhears the rest of their angry conversation as they try to divide the loose diamonds, which they have hidden in the rattle. The man says to the Runner, “Great! Everything was perfect until you got yourself followed. Well, watch this kid. Don’t let her get away” (43). His harsh words prove that he is just as cruel as the Runner.
The witnesses are secondary characters in the story. They are two elderly women who were in the store when the robbery happened, and they recall that a single man robbed Mr. Parker at gunpoint. After this ordeal, the women are frightened and shocked. The author writes, “The women were upset. One was clutching her heart. The other was leaning forward and holding a cane with both hands. She walked as if the cane were the only thing keeping her up” (11). Nevertheless, they are eager to share their experience with Cam and Eric, and their information gives the children what they need in order to solve the mystery. The women accurately remember that “the Runner” was not the thief with the gun, and they earnestly try to help the police. At the end of the story, the women’s misunderstanding about the thieves creates a humorous ending and gives rise to a lighthearted moment of dramatic irony. Because they do not realize that the young couple was involved in the robbery, the women suggest that the police should tell the couple that the robber has been caught. This suggestion shows that although the women are thoughtful and caring, they not as well informed as Eric and Cam.



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