At the Théâtre de l’Impossible, every illusion is real. This time, so is the murder.

Six months after joining a wandering theatre filled with vampires, fae, shapeshifters, ghosts, and secrets, playwright Julien de Montfort is finally beginning to feel at home.

Then celebrated illusionist Adrien Beaumont arrives in Vienna with his greatest creation: a black cabinet designed to make a chained man disappear before a live audience.

On opening night, the lights fall for six seconds.

When they rise, Adrien is still inside—dead, his blood spelling a warning across the cabinet:

ONE OF YOU LET ME IN.

The police seal the theatre. A relentless inspector begins dismantling the company’s carefully constructed identities, while reporters uncover photographs of performers who have worn the same faces for more than a century.

And across the street, a mysterious woman watches Mikhail with the face of someone who should have been dead for nine hundred years.

To protect his impossible new family, Julien must discover how a killer entered a locked cabinet—and who opened the door.

A darkly witty supernatural locked-room mystery filled with gothic magic, dangerous secrets, found family, and impossible love.