Billions of Regrettable Decisions are made every day. All she needs is one chance to save him from his.

Marianne Bertrand knows nothing about her past. She gave up her memories to become an agent for the highly secretive Bureau of Second Chances, where she seamlessly slips through time and puts wrongs to rights in the hope of redirecting others down a path of happiness.

Walter Page is hollowed by the tragic loss of his wife. Every day he pushes further and further away from his loved ones, each catastrophic choice made in the fog of grief cementing his loneliness.

When the map of Walter’s life crosses Marianne’s desk, she finds herself captivated. Determined to reawaken the hope that has long since left him, she is dropped into 1950s London and into Walter’s existence, ready to rearrange his fate. But as she falls ever deeper into Walter's story, Marianne realizes that in order to rewrite his future, she’ll not only need to confront her own buried past…but also her unexpected connection to his late wife.