Jonesy and Susie head to the site of an ecstasy overdose only to discover Jonesy's young brother Dylan, with the Drug Squad, got there first. Dylan loves to snub his brother because of their positions and soon leads an investigation into drugs in Mt. Thomas without listening to Jonesy's evidence. Jones goes after a brother and sister pair who he suspects, even though they are Dylan's friends, and his vigilance has even Susie convinced that he is just doing it to beat his brother. Meanwhile, a surprise 30th birthday party for Jonesy comes to a head when he fights with his brother, and they are seen fighting by Tom and Commander Jones - the boys' father. Later, Dylan collapses on the dance floor...

Dylan dies of an ecstasy overdose, after convincing his father that he doesn't take drugs, and it was Jonesy's fault. Susie enlists PJ's help to see whether it was Dylan's friends or his colleague who spiked his drink. Although Jonesy tries to keep his family name clean, his father soon suspects him of being on drugs and Inspector Monica Draper arrives to investigate. So when Jonesy finds evidence that his brother himself was on drugs, he is torn as to whether he should take the fall, or reveal what his late brother was really like.