A series of crimes strikes the Venice area but they are unrelated and there are no motives to explain them. Endowed with a vivid imagination, former astronomer Andrea, now a passionate politician reading pulp fiction and detective novels, casually notes strange indications leading him to suspect David, his partner’s son, is responsible. Only one thing is certain: the killer is acting in accordance with the temporal law regulated by the Fibonacci sequence. The one to discover this is Bobo, one of David’s university friends and a brilliant logical-mathematical mind.