Silent Witness

The Lost Child (2) (12x10)

Air date: Oct 30, 2008

Nikki's loyalty towards her former mentor, Noel Hopkins, is severely tested when past allegations of sexual misconduct from a former student surface. Leo and Harry refuse to give up their search for Liam, as they try to identify and locate a toxic chemical which was found in both bodies. If they can find the source of the chemical, they may find where Liam is being held.