Events continue to spiral at the university, and Cara becomes collateral damage. The riddle of the body in the Thames is solved. A breakthrough in the Cherry case is received from an unlikely source, but will the team get there before it is too late?

Ashley Margolis, Diveen Henry, Emily Piggford, Isobel Wood, John Thomson, Kaye Wragg, Kevin McNally, Maeve Courtier-Lilley, Richard Keep