Hollis spots a gang of youths hanging around a phonebox acting suspiciously. When he goes to investigate, the phone box explodes as the result of a volatile homemade bomb being planted inside. When a second bomb goes off at a nearby primary school, badly injuring a young boy, Brownlow and Hollis question the ringleader who reveals that there are a total of ten bombs, which he has sold to his friends or classmates. Brownlow then demands Monroe set up a widescale operation to search for the remainder of the bombs. When one is found inside a boiler cupboard of a young boy living in a council block, Conway has trouble evacuating an agoraphobic resident. When Hollis finally catches up with the culprit, he reveals he has one more bomb.

Luke and Craig follow a confusing trail after a car pile up leaves a man hospitalised. Now if only there was a driver to blame... Luke is doing his level best to ignore everything the lovestruck Sergeant wants to discuss. Craig is desperate to discuss their kiss, and as if by magic, turns up wherever Luke gets called to. DS Phil Hunter manages to set himself up as security in a club he suspects is being used to traffic drugs. He's determined to make sure PC Nick Klein is his back up, Nick is understandably weary... but he'll do it; as long as it's all above board. As it just possibly might be with Phil in charge!Samantha Nixon may be the new kid on the block but she's the choice for Acting D.I in the wake of Alex's sudden departure. She's going to have a difficult time keeping that lot under her thumb, not least of all keeping an eye on Phil Hunter... and his attitude! The Superintendent's past is catching up with him. His father turns up begging for money for his drug addict brother,