The Hypotenuse Crime

The maths teacher, nick-named Hypotenuse, has disappeared, leaving behind mysterious blood stains. At school, inspector Arveja begins a lengthy interrogation of the students whom Hypotenuse was about to suspend: Nico, Maria, Roman and Boris... they are all suspects but only one of them is guilty. And Inspector Arveja is determined to unmask the culprit.

Titles in the series:
- The Class Where I Fell in Love With You
- The Music on the Wind
- The God's Gold
- Interior Zones
- The Hypotenuse Crime