Rome is shattered by a series of gruesome murders that paint the Eternal City deep red. The suspicion grows that these atrocious crimes are connected with the return of one of the most heinous serial killers of our time - Karl the Butcher.

A psychopathic serial killer starts to murder a few guys. A young police officer wants to catch him, but it will be very hard to do it, because... Which are the "Love Limits"?