Randolph James and Dr. Hans Lang have finally succeeded in developing a new antibiotic. Randolph's former employer, Hudson Bradshaw, head of a major drug company, wants to buy the rights to the antibiotic, but Randolph refuses to sell. Bradshaw threatens a suit against Lang-James Laboratories for pirating the idea for the drug from his company. Randolph learns that his unfaithful wife Natalie plans to sell her stock in Lang-James to Bradshaw. When she finds out that the stock may be worth three times as much after a loan was approved and production is about to start, she demands three times as much from Bradshaw as he had previously agreed to. After talking with Bradshaw's wife, Natalie is run down by a car resembling Randolph's station wagon. Randolph is charged with her murder and Perry defends him. To save his client Perry may have to locate two witnesses - a mysterious fisherman and his dog.
—rbecker28