Michael Canale

Calvin and Leonard, two broke losers, are arrested for trying to rob rich old sisters Doris and Betty. The women have a change of heart, drop the charges and invite the the boys over to their mansion. Calvin decides he and Leonard should marry the women, and, when they soon die, live off the inheritance. The ladies, however, have run into their own financial troubles and wed the boys with plans of murdering them for insurance money.

Greg Sanderson is helping his wife, Jan, to recover from a nervous breakdown and revive their strained marriage. Their privacy is interrupted by the arrival of Greg's stunning and mysterious sister, Laura. Jan's paranoia deepens as she suspects that Greg's and her sister's relationship is too close. In her desperation, she confides her fears to the landlord but his weird reaction only creates more confusion.