A dead notary. A locked room. A vanished girl who may have never vanished at all.

When respected notary Vittorio Alessi is found dead inside his private archive, the case appears impossible. The room has no windows. The door is locked from the inside. There is no weapon, no sign of struggle, and no obvious way for a killer to escape.

But Inspector Elias Moretti notices what others are too eager to ignore: an old rusted key on the desk, a strange burn around the victim’s wrist, and a torn photograph hidden beneath the carpet.

The photograph leads him to Villa Argenti, a decaying mansion tied to a twenty-year-old disappearance. A young woman named Livia Serra vanished there during a private party attended by some of San Vittore’s most powerful families. The case was closed quickly. Too quickly.

As Moretti digs deeper, he discovers a town built on silence, forged documents, stolen inheritances, and carefully buried lies. Every suspect had a key. Every witness has a secret. And the dead man in the locked room may have been guarding the truth rather than hiding from it.

But when old names return, new bodies fall, and the past begins speaking through photographs, recordings, and confessions, Moretti must face the most disturbing question of all:

What if the girl everyone believed was gone has been hiding in plain sight?

The Door of San Vittore is a gripping locked-room detective mystery filled with secrets, betrayal, corruption, revenge, and a haunting investigation where the real crime is not only murder—but the silence that allowed it to survive.