Degrees of Error present an improvised 1934 whodunnit where the audience chooses scenario, weapon, victim and murderer while a detective narrator controls the action.
Dame Helen Mirren and Pierce Brosnan on the red carpet in Leicester Square for Thursday Murder Club premiere
A star-studded film follows four retirement-home friends who solve cold cases until an unexplained death forces them into a real whodunnit, highlighting overlooked older characters' wisdom.