Tensions are high as the group heads further down south for Cam's birthday trip to Key West. Austen questions Chelsea's commitment to their relationship after she changes her story about the incident with Shep, and Craig finds himself on thin ice with Naomie. Meanwhile, Kathryn reveals shocking new information about Thomas and Landon's relationship. And when she confronts Landon face to face at a group dinner chaos ensues after Craig intervenes and Thomas witnesses the ultimate betrayal.