Following the showdown in Europe, Ewing Oil and Weststar begin a new battle. Cliff is preoccupied at work. April's sister, Michelle, shows up in Dallas. Tommy returns home and attempts to make amends. Miss Ellie starts a search to find what the key in Jock's card opens.

Tommy claims to be a changed man as he plots revenge against Bobby. Cally's paintings manage to impress a gallery owner. J.R. makes a risky deal without Bobby's knowledge. Cliff manages to locate Afton. The mysterious key sends Miss Ellie and Clayton to New England. J.R. meets April's sister.

J.R. thinks about agreeing to a risky deal on a tanker when he needs oil badly. Cally has trouble getting past the fact that April once slept with her husband. Michelle meets Cliff in secret. Miss Ellie and Clayton's treasure hunt takes them to the town where Jock first struck oil. Tommy's violent temper gets out of control again.

Tommy ends up planting a bomb in Bobby's briefcase in an effort to protect his father against some perceived threats. J.R. comes to a decision about the tanker deal. Cally's art causes further interest. Cliff feels left out of the loop at Ewing Oil. Miss Ellie and Clayton make their way to Pride in Texas.