Linda and Michael Waterman are both successful fiction writers, happily married to one another. They thrive on the give and take of their unusually honest and candid relationship. However, when Linda is diagnosed with a tumor, she asks her husband to share his diaries with her.

The entries dive into Michael’s past stay at a writer’s retreat and a hidden affair. Michael says that his entires are only works of fiction. The boundaries between past and present, fact and fiction, trust and betrayal begin to break down, and that’s all before Michael reads Linda’s diaries. No life, as it turns out, is an open book.