Prescription for Murder (1958)

In "Rx for Murder" and "Rx Murder" in the USA (and not "RX" in either country), American doctor Jethro Jones comes to a quiet English seaside resort to investigate the activities of its leading medical doctor, Henry Dysert. He learns from Miss Bettyhill, the town gossip, and others that 'the good doctor' might not be all that good, since each of his three former wives - Louise, Charlotte and Stella - had mysterious and tragic deaths. The non-gossiping townspeople had regarded the three deaths, each of which left Doctor Dysert in better financial shape, as unfortunate personal tragedies. Jason has only a short time to prove that Dysert was a multiple wife-killer, since Kitty Mortlock appears to be the next designated victim, and Jason has fallen in love with her.