What would you say if your chemistry teacher disappeared overnight? Obviously, you'd bet on him - unless he's your favorite, and he gave a strange and seemingly incomprehensible puzzle in the last lesson.
Sági, Bogdán, Vaki and Petra immediately start investigating, but it soon turns out that the solver also wins a lot of money. As the stakes rise, the whole town soon throws itself into the game, and quite a few underworld figures show up...
Are the Ságis clever enough to solve the puzzle? Can they hold their own in duels with old computer games? Can they defeat the evil Evilbell? And above all, will they manage to free Petra, who was kidnapped in the meantime?

While the whole city is turned upside down, and teenagers have to hold their own in the digital and the real world, in apps and in social relationships, the reader gets to know the iconic locations and hidden gems of contemporary Budapest.

Ádám Szűcs researched the secrets and good moments of Budapest on a daily basis for ten years as co-owner and author of the blog One day in the city. He organized many city tours, where the main guiding principle was always surprise and play.
His first youth novel also builds on the power of surprise and presents the capital city to teenagers in an exciting, twisty, fresh language.