Author Grady Green is having the worst best day of his life. Grady calls his wife to share some exciting news as she is driving home. He hears Abby slam on the brakes, get out of the car, then nothing. When he eventually finds her car by the cliff edge the headlights are on, the driver door is open, her phone is still there. . . but his wife has disappeared. A year later, Grady is still overcome with grief and desperate to know what happened to Abby. He can’t sleep, and he can’t write, so he travels to a tiny Scottish island to try to get his life back on track. Then he sees the impossible.

Lex Gracie doesn't want to think about her family. She doesn't want to think about growing up in her parents' House of Horrors. And she doesn't want to think about her identity as Girl A: the girl who escaped, the eldest sister who freed her older brother and four younger siblings. It's been easy enough to avoid her parents - her father never made it out of the House of Horrors he created, and her mother spent the rest of her life behind bars. But when her mother dies in prison and leaves Lex and her siblings the family home, she can't run from her past any longer.

In a split second, Morgan Kincaid’s life changes forever. She’s on her way home from work when a mother begs her to take her baby, then places the infant in her arms. Before Morgan can stop her, the distraught mother jumps in front of an oncoming train. Morgan has never seen this woman before, and she can’t understand what would cause a person to give away her child and take her own life. She also can’t understand how this woman knew her name.

Following a traumatic event in London, Kirsty Woodhouse packs up her family and moves back to her native Wales. There she sets up her new home with her husband and two young daughters, and goes into business with her difficult mother managing a guesthouse in the Brecon Beacons. But when the guesthouse is ready to be occupied, Kirsty encounters the last person she ever expected to see: her estranged cousin Selena. It has been seventeen years since they last talked—when Selena tore everything apart between them. Why has she chosen now to walk back into Kirsty's life?

Flight attendant Allegra Patel loves her job, but today is her twenty-eighth birthday and she’d rather not be placating a plane full of passengers unhappy about a long delay. There’s the well-dressed man in seat 4C desperate not to miss his daughter’s musical. A harried mother frantically tries to keep her toddler and baby quiet. Honeymooners still in their wedding finery dream of their new lives, while a chatty emergency room nurse dreams of retirement.