S5, E15: Lindsey (recurring guest star MICHAELA McMANUS) returns to Tree Hill for Jamie's (recurring guest star JACKSON BRUNDAGE) fifth birthday party, giving Lucas hope for their relationship. Brooke and Peyton prepare for life with a new baby. Meanwhile, Dan (recurring guest star PAUL JOHANNSSON) tries to insinuate himself back into the lives of his family, ultimately divulging a grave secret to Nathan and Haley.