The Bill: The Big Day (Part 2)

Part two of two. Zain is troubled on the anniversary of his sister's drug-related death but decides to continue with his undercover operation, even though it means lying to Kristen. Will assumes Matt was behind his beating and throws a punch at him - only to end up being arrested by Tony for his actions. Yvonne impresses Heaton by getting a result in the break-in case involving Billy Aldridge