ESTUARY opens in the disorienting aftermath of loss: Megan Mostly nearly collapses when she finds her son, Lincoln, awake and watching television in the middle of the night-despite the fact that his funeral was only a week ago. As if grief weren't enough, Stephen Tremble appears at her door the day before, asking an impossible question: was Lincoln his son? For six years, Megan has lived inside a carefully constructed lie. Now it's cracking open. Stephen, newly returned to Atlanta, is unraveling too. After a fire exposes the hoarded remains of his isolated life, he clings to the one object that survived-a diary he can never seem to lose. Inside it, he finds an entry he doesn't remember writing. It speaks of a child he never knew existed. As Megan is drawn into a series of unsettling encounters with a mysterious woman who appears without warning, delivering cryptic messages that seem to echo Lincoln's presence, Stephen grapples with the fury and grief of a father too late to love. Pulled together by secrets, loss, and a child who refuses to stay gone, Megan and Stephen must confront their pasts where memory and longing converge-at the estuary between what was, what is, and what still refuses to let go.