Bubble : a thriller
(Book)

HP could never have imagined he'd become entwined in a chaotic and dangerous game of life and death when he picked up a lost cell phone on a commuter train. He thought he'd escaped. Now, his paranoia quickly grows to mania, as he is convinced that the Game Master and past characters are following him and that the police are watching him HP decides he must finish one last assignment and expose the Game Master's secrets once and for all, no matter what it costs him. What he uncovers is a potential link between his own father's past and the Game, blurring the boundary between it and real life more than ever.

Translated from the Swedish.