The Silent Killer

Sue Ellen's mother, and predatory sister, Kristin, arrive at Southfork for a visit to see baby John Ross, much to Lucy's displeasure. Digger Barnes is back in Dallas visiting Cliff and Pam, but he's not well. He's diagnosed with a genetic disease which affects the whole family. Though they know that John Ross may be Cliff's son, he and Pam decide to keep the disease a secret. Meanwhile, J. R starts to take a closer look at Sue Ellen's baby sister...