Imagine that right now, directly beneath you, someone is lost underground and desperately calling for help. A group of four people are trying to find the legendary catacombs of old Prague, but their expedition into the labyrinth of medieval corridors turns into a fight for their lives. Which is more dangerous: an inaccurate map or an ancient secret?

A group of high school seniors begin arguing at their graduation party about how to get hold of the exam questions. Martin, who is known for his knowledge and skills in cybernetics and computers, bets the others that he can download the questions from the Ministry of Education's server. The other students are counting on Martin to download the questions, so they don't prepare much for the exam. Ho...