Time Waits (S01E07)

One night Leonardo is in the city's morgue, secretly (and illegally) studying anatomy, when he hears ticking from inside a corpse. Cutting it open, he discovers a tiny gold watch, which proves to run backwards. Later, with the help of his friends, he discovers that the dead body is that of a mysteriously drowned watchmaker and he deduces that the watch might possess the power to take people back in time. Will the gang be able to discover how to make it work or will Piero's henchman Mazzini hunt them down before they can unlock its secret? (BBC)