This summer vacation story of three Prague kids, Alena, David and Ondra, and the charismatic treasure hunter Aaron Cohen (Borivoj Navrátil) takes us to the most mysterious places of old Prague, to the ruins of an old water castle and the domains of wondrous entities from days gone by. Those are some of the interesting and historical settings for this thrilling and adventurous hunt for a mysterious talisman, the fabled Golem, and the legendary Philosopher's Stone.