The Overdue Life of Amy Byler

The novel opens with a letter from Cori, a fifteen-year-old girl writing from a hospital bed to her mother, Amy. Cori admits her mother was right about her father, expresses regret for the decisions that landed her in the hospital, and asks Amy to make whatever choice will bring her happiness. The letter serves as a flash-forward; the main story begins three months earlier.

Amy Byler is a school librarian and single mother in small-town Pennsylvania. Three years ago, her husband, John, packed a carry-on for a business trip to Hong Kong and never came back. Now he appears at the local drugstore, insisting he has returned to be a father to their children, Cori, now fifteen, and Joe, now eleven. Amy breaks the news to the kids and her best friend, Lena, a former nun who teaches ethics at the private school where Amy works. Lena argues that punishing John may not serve the children, and Cori reluctantly consents to one trial week at the start of summer.

With the kids set to spend a week with John, Amy finds a library educators' conference at Columbia University. She signs up to present the Flexthology, a reading-engagement system in which students choose from books at different reading levels loaded onto e-readers so that level differences remain invisible. She reconnects with Talia, her college best friend and editor of Pure Beautiful, who insists Amy stay at her Brooklyn apartment. At a family dinner, John charms the children with a nostalgic gift and gives Amy a credit card for emergencies. Amy also learns that she and John never finalized their divorce.

Amy departs for New York, reflecting on the crushing weight of single parenting, including a panic attack that once brought her close to a mental health crisis. In the city, Talia's apartment building is locked down for a murder investigation, so Amy books a room at a boutique hotel on John's credit card. At the conference reception, she befriends Kathryn, an energetic librarian from Chicago Public Schools. The next morning, a fraud-prevention call reveals charges on John's account for lingerie shipped to Marika Shew, the woman John took up with after leaving. Amy had assumed the relationship was over. Devastated, she channels her anger into her presentation.

At the conference, Amy presents the Flexthology. Daniel Seong, a resource librarian in the New York public schools, challenges her on the lack of diversity in her title selections and asks her for coffee. Their conversation shifts from professional to personal; Daniel has a daughter, Cassandra, who attends Bronx Science, a selective public high school. Amy feels an attraction she has not experienced in years. They spend the evening together and end up sleeping together. The next morning, Amy panics and calls Lena, who reassures her that consensual sex between single adults carries no shame. Amy frames the encounter as a one-night stand and leaves for Pennsylvania, telling Daniel to stay in touch.

Amy moves into Talia's apartment and is swept into a makeover orchestrated by Talia, Lena, and Talia's editorial assistant, Matt Clarke. Talia reveals that Amy's visit is being shaped into a "momspringa" feature for Pure Beautiful, a trend piece about a single mother reclaiming herself. Matt oversees a hair transformation, bra fitting, and wardrobe overhaul. The makeover photos go viral on social media under the hashtag #momspringa.

John calls to ask Amy to extend his time with the kids for the rest of summer, offering diving camp for Cori and Space Camp for Joe. After returning home and seeing how happy both children are, Amy agrees. She spends the rest of the summer house-sitting Talia's Brooklyn apartment while Talia relocates to Miami for work. Daniel finds Amy through the trending hashtag, and they reconnect. Daniel proposes they remain just friends, explaining that a summer fling would hurt him. Amy is disappointed but agrees, and they begin spending time together, collaborating on Flexthology book lists.

Matt arranges blind dates for Amy as part of the magazine feature. None of the men spark the connection she feels with Daniel, but collectively they build her confidence. Kathryn calls with exciting news: Her school principal has approved a Flexthology pilot program.

After weeks of restrained friendship, Amy and Daniel's feelings break through during a night at Shakespeare in the Park. They see Julius Caesar at the Delacorte Theater, and Daniel confesses he finds Amy beautiful, interesting, and impossible to keep at arm's length. They kiss, and their relationship becomes openly romantic. Over the following weeks, they spend nearly every day together while avoiding any discussion of summer's end.

Amy meets Cassandra for lunch. Cassandra is sharp and protective of her father. She reveals that Daniel's ex-wife left them for three years before returning, now married to a woman. The abandonment mirrors John's departure. Cassandra challenges Amy, suggesting that her momspringa, like the Amish rumspringa in which young people explore the outside world before committing to their community, must end with a decision: go home or never turn back.

This confrontation triggers a crisis. Amy is gripped by guilt over having neglected her children all summer. She leaves Daniel a voice mail saying their situation was doomed and packs frantically. Daniel arrives at Talia's building, and Amy tells him she is leaving not because her kids need her but because they don't, and that realization has undone her. They part at Penn Station with a kiss.

Amy arrives home in time to see the kids off to camp. On the long drive to drop Cori at the diving program, she and John have their most honest conversation in years. He admits he came back for the children, not for Amy, and intends to return to Hong Kong when summer ends. Amy raises the miscarriage they experienced before John left, but he deflects, telling her she has defined herself solely as the woman he martyred. Amy recognizes the painful truth, and any lingering romantic feelings dissolve.

On the drive home, Amy's phone rings. Cori hit her head on the diving board while sneaking into the pool with friends and has not regained full consciousness. Amy and John race to the hospital, where doctors diagnose a subarachnoid hemorrhage, a brain bleed requiring emergency surgery. Amy takes charge, signing consent forms while John breaks down. During the surgery, Lena, Talia, Daniel, and Matt all arrive. Amy realizes that these people, not a restored marriage or a single location, are her true community.

The surgery succeeds, and Cori recovers. Amy and John finalize their divorce, with a settlement that includes back child support. John returns overseas but commits to regular visits. Amy and Daniel begin an official long-distance relationship, planning to reevaluate when Cassandra graduates the following spring. Daniel and Kathryn reveal they secretly secured a National Endowment for the Arts grant to fund Amy's Flexthology pilot in underfunded schools. Joe asks about applying to Bronx Science, and Amy allows herself to imagine a future move to New York.

The novel closes with letters and tweets responding to the momspringa article. Readers range from enthusiastic mothers organizing their own momspringas to an outraged subscriber canceling her subscription. Amy arrives at the story's central insight: She can be fully a mother and fully herself, and caring for herself is not a betrayal of her children but a necessary part of caring for them.