Hardy keeps a mistress on the side, aspiring stage actress Linda Lee. Unbeknownst to him, she is Jim’s sister and in love with Georgie Keeler, a Broadway producer. Things become serious between Carol and Jim. He begins neglecting his work and eventually spends the night with her. The next day, he asks her to marry him. She realizes that she is distracting him from making a success of his engine and turns him down.
When Hardy asks Carol once again to marry him, she jokingly tells him she would only consider his offer if she were broke. He then informs her that she is. He has been paying all her bills for the past year. Hoping to help Jim, she agrees to wed Hardy.
Hardy tries to break off his relationship with Linda. This is what Georgie has been waiting for. He has coached Linda to extort $50,000 from Hardy to finance a new play in which Linda will star, but the businessman will only write her a check for $10,000. To try to pressure Hardy, Georgie has Linda lie to Jim about the relationship.
Meanwhile, Carol has second thoughts and goes to break the news to Hardy. Before she can, Jim shows up and insists that Hardy marry his sister. When Hardy shows him the canceled $10,000 check endorsed to Georgie, Jim realizes Linda has deceived him. He apologizes and leaves.
Carol decides to kill herself by crashing an aircraft. As she starts to take off, Jim reads the suicide note she left with Gilligan. He manages to cling to the fuselage, works his way gingerly to the cockpit (while the aircraft is in flight), and reconciles with Carol.