PBS | 9:00 pm
In the Season 4 finale, Sunny (Sanjeev Bhaskar) takes over the team, arresting the suspects for further questioning, and their story soon begins to unravel. After Grayson (Liz White) gives a full account of what she witnessed, Sidhu (Phaldut Sharma) admits he found Walsh injured and attempted CPR. A suspect confesses to the murder after being confronted with evidence showing that he had a connection to the fountain pen used in the crime. Nicola Walker also stars.