Love is the Drug

"Love is the Drug" is the 859th episode of Casualty and the 37th episode of the 27th series.

Synopsis
While out for a jog, Tess is forced to intervene in the stabbing of a teenager, and when the victim arrives at the hospital, she continues to console him. However, when an agitated mother turns up with her wounded son, Tess identifies him as one of the attackers. Meanwhile, Charlie comes to the aid of a couple whose relationship is feeling the strain of the wife's long-term illness.