Naomi Bellamy never expected to receive a letter from her sister — especially not ten years after her death.

The envelope arrives on a gray Tuesday, worn and watermarked, with no return address and one chilling line inside: "Find me where the lost things go."

Following a trail of forgotten mail and cryptic symbols, Naomi stumbles upon a hidden post office tucked beyond the boundaries of the living world — a place that exists between time, memory, and magic. Here, letters never delivered are sorted and stored by those who were once lost themselves, now tasked with bringing final messages to those who need them most.

But as Naomi digs deeper, she uncovers a haunting truth about her sister's death — and a choice that could cost her everything she has left. The more she lingers, the more her own memories fade. To leave, she must deliver one last letter... and decide what she's willing to forget to remember who she is.

A haunting, heart-aching journey through grief, love, and the magic of words left unsaid — perfect for fans of The Midnight Library and The Invisible Life of Addie LaRue.