Collision is crime drama series broadcast on ITV1 in the United Kingdom. John Tolin returns to the police force after an extended period of leave from his job as detective. His first day back at work though ends up seeing him investigating a difficult case involving a road traffic accident.
Tolin and Ann try to find out what Karen was really up to. After looking into into Sidney's past they manage to unlock the secret of his computer. Richard and Jane decide to run way together. The truth about what caused the crash is finally revealed.