Everyone was found dead, with no trace of violence, poison, or disease.

A gun was found in a drawer, but it was proved conclusively that it had never been fired.

The authorities were baffled to no end: the gun had everyone’s prints all over!

Everyone knew it was there, but no one dared use it.

Each one of them died, one after the other, while the detective tried in vain to puzzle things out.

In the end, he died, too.

And the gun remained in the drawer.