On the eve of the annual Valleby Games, the competitors are injured one by one. The clues lead Jerry and Maya to a dark secret and an old myth about the games' mascot that is said to haunt the hall. Will Jerry and Maya find the solution before anyone else gets hurt and will their friendship survive the trials?

As people in Valleby are looking forward to Valleby Day, a thief suddenly strikes and carries out a series of thefts, leaving behind symbols linked to the Zodiac and space.