german friends found dead in swimming pool

International students at an elite Prague school are stalked and murdered by a masked killer while holding a party in an abandoned water park.

Left alone to clean up a 6-meter-deep deserted pool, Day falls asleep on an inflatable raft. When he wakes, the water level has sunk so low that he can't climb out on his own. Stuck in the pool, Day screams for help, but the only thing that hears him is a creature from a nearby crocodile farm.

Two friends find the body of their water polo teammate in the pool, setting them on a search for the answers they don't believe the police will find.

Deaths are increasing around Lake Ossiach this winter. An unknown body washes up on the shore of the miniature golf course, a diabetic dies of hypoglycemia on a park bench and another lady is found dead in her house...