A Knife for a Knife - S10.E22

Tom's teenage step-son, Daniel, finds a class mate stabbed in an alley, Jonesy and Tess are shocked to find the young victim had a knife. Daniel denies any knowledge of armed gangs, but his younger brother says otherwise. When the teenage stab victim goes missing from the hospital, Jonesy and Tess find the boys in a tense stand-off armed with knives. Tess tries to take control of the situation, but when one boy lunges in her direction Jonesy throws himself in between them and takes a knife in the torso.