Well, the main bias of the film is that, after discovering, at the end, the unexpected serial killer, no motive whatsoever is given for his/her (I won't tell) murders. Why these crimes were committed? Nobody knows. This fact pulverizes the entire possible consistence of the plot. The killer could have been Peter Pan, or Mickey Mouse, or my aunt: nothing would have changed.
Incidentally, as a side-observation, let me say as an exemple, that the Italian title for the film is, according to many (also authoritative) sources: "FBI, squadra omicidi", which translates as "FBI, homicide squad". It's quite funny, because no FBI man is involved, and even less any homicide squads. Though Italian titleing of US films has been constantly quite fancy and often misleading, in this case the coupling of the titles must have been derived from a sort of original error which has never been emended since; nor I am able, at the moment, to get to the source of that misunderstanding.
Incidentally, as a side-observation, let me say as an exemple, that the Italian title for the film is, according to many (also authoritative) sources: "FBI, squadra omicidi", which translates as "FBI, homicide squad". It's quite funny, because no FBI man is involved, and even less any homicide squads. Though Italian titleing of US films has been constantly quite fancy and often misleading, in this case the coupling of the titles must have been derived from a sort of original error which has never been emended since; nor I am able, at the moment, to get to the source of that misunderstanding.