Dan reminds Karen that he once asked for joint custody of Lucas when he was a baby; Peyton panics after Nicki kidnaps Jake's baby while she is babysitting.
Lucas returns to school after his heart attack, hoping to rekindle his romance with Peyton; Haley learns that Nathan was responsible for her accident; Brooke and Rachel have a plan to steal the next calculus exam.
Nathan and Haley grow closer; Brooke wonders if a spark might be rekindled with Chase; Peyton receives a tempting offer; Mouth reconnects with Gigi.
Brooke faces the fact that secrets are not the only thing she exposed for the time capsule; Peyton's Breast Cancer Benefit Concert features performances by Haley, Jack's Mannequin, and Fall Out Boy.
Tom leads the search for Rachael, as her situation becomes increasingly dire; Maggie and Dr. Ward make a series of unexpected discoveries.