Dr. Kimble works on a horse farm owned by a wealthy couple. Harlan Guthrie married his wife Ann for her money and is having an affair with Ann's sister Carol. Ann loves Carol, but Carol is jealous of Ann and wants everything she has. Harlan and Carol conspire to kill Ann and make it look like an accident. Once Carol, a photographer, discovers who Kimble is, the plan changes so that Ann will be murdered but it'll look like Kimble did it. Kimble tries to warn Ann, but she doesn't believe him because she loves her husband and sister.