Praying Mantis 1983

A man and a woman drift ashore after a typhoon. The man, dead, is an escaped perpetrator, and the woman, alive, is a hairdresser Masako. A detective in charge of an embezzlement case is tracking the whereabouts of disappeared money and suspects Masako. One year later, a real estate company president dies a suspicious death in front of Masako at her beauty salon. Was it an accidents or murder?