Something Is Rotten — J.M. Gregson

A Lambert and Hook mystery - DS Bert Hook is cajoled into auditioning for a local Shakespearean play. Desperate to get out of it, he expects his boss, John Lambert, to forbid him from performing. No such luck. Hook meets a rather surprising and sinister cast of characters. And when the director is found murdered, Hook needs to find the truth and fast. Who is innocent, who is just playing a part and who is really rotten to the core?