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From the liner notes

Directed by Flavio Mogherini, Crime of Passion is an Italian/Bulgarian co-production that stars Florinda Bolkan, Serena Grandi and Fabio Testi. This giallo mystery thriller tells the gripping tale of an adulterous man whose wife is found dead followed just days later into death by his mistress.

Famous writer Sonia Petrova is killed after a night spent in a seedy motel with her lover. Her husband Peter is immediately taken in by the police and questioned. Ivan Zanova, the detective investigating Sonia's murder, is aware of the fact that both Peter and his wife had adulterous affairs. When a homeless guy confesses the murder, Zanova believes that this bad case is finally closed. But a few days later, Peter's mistress suffers Sonia's same fate by the hand of a mysterious killer, and Ivan understands that there is more than meets the eye in these two killings.