The Bill: Frontline: Endgame

Series 5, episode 0

Callum assures his colleagues that he will find the bomber, then a message comes telling them that another device will explode in three hours. Grace interviews Carl Adams and Jeff Bowman - who were targeted in the earlier attacks - but the team are shocked to discover that Emma's murderer has been in the station the whole time. The bomb is traced to a mother on the school run. Mickey manages to drag her to safety, but when Callum goes to save her baby, the car explodes.