It's Camden chaos all around when Matt, who is having problems in his marriage to Sarah, returns to Glenoak for a visit and runs into his ex-girlfriend Heather on his flight to Glenoak. Simon unexpectedly announces he's coming home for the summer. Also, Lucy sets out to discover why Roxanne is suddenly too busy to hang out with her as she's convinced that Roxanne is secretly trying to become a detective behind Kevin's back. Ruthie keeps a secret about a fellow student from her parents. Lastly, Martin learns that his baseball teammates think he's having sex with Cecilia.