The team pieces together the mystery of a man found dead on the shore of the Thames, while the life of a disgruntled criminology professor begins to unravel.

Ashley Margolis, Diveen Henry, Emily Piggford, Harry Lister Smith, Isobel Wood, James Craze, John Thomson, Julie Jupp, Kaye Wragg, Kevin McNally, Maeve Courtier-Lilley, Richard Keep