1912. A mysterious and luxurious Casino hidden in the mountains outside Barcelona, the cradle of the European Art Nouveau explosion; a legendary secret room where gamblers who had lost everything could discreetly commit suicide; a serial killer on the loose; "Bicycle man", a young and peculiar police sub-inspector who will never give up.

2021. The ruins of an old casino are barely visible through the vegetation; a serial killer still on the loose; a journalist in search of a story that can revive his declining career; was the suicide room just an urban legend?

Two people investigating the same crimes and chasing the same serial killer, but living one hundred years apart.

One simple question. Could a man be forced to commit suicide to save the lives of his loved ones?