locked room mystery book ideas

The Expedition That Found Its Own Footprints

In a fictional 1928 expedition, a surveyor finds tomorrow's camp already abandoned and a grave bearing the expedition sponsor's name. Her photographer has already developed the funeral.

The Murder Before Breakfast

A breakfast-club organizer receives the victim's meal rating before the murder occurs. The eggs provide an alibi no one believes.

The Widow's Seating Plan

A wedding planner finds a seating chart that places six widows beside the same missing husband, just before the reception is sealed.

The Backup Librarian

An archivist must question her own retired AI copy after a book vanishes from a sealed lunar library and every index insists it never existed.