When graphic designer Margot Finch rents a too-cheap Brooklyn apartment, she discovers the source of the mysterious knocking: Alistair, a poet who died in the closet in 1924. Trapped for a century by unfinished business, he can only communicate through knocks and demands for "direct, unambiguous honesty." What follows is an unlikely friendship spanning life and death, as Margot helps Alistair reconnect with the world he left behind—including the lost love who kept his memory alive. A heartwarming, humorous story about second chances, unwritten promises, and the doors we choose to open.