In this low-budget, erotic thriller, aptly titled
The Diary of a Murderess
, a seductive, scheming woman (Marissa Mell) meets and insinuates herself into the mansion of a fabulously wealthy film producer (Richard Conte). When he mysteriously dies, the sinister opportunistic woman is left with his fortune. Or so she believes. The man's suspicious son (Anthony Steffen) pretends to fall in love with her but catches her in her own trap. The film is poorly acted and directed, with a notable lack of suspense, but Mell is quite beautiful and fans of hers should enjoy this silly, gothic murder mystery.