When a prestigious chess match ends in murder, the team must work out how and why the killing was carried out. Meanwhile, the commissioner is confronted with his past by the very last person he was expecting to see.
Quest roles:
Ginny Holder(Darlene Curtis), Paul Bown(Maurice Holburne), Anders Hayward(Lucas Magnussen), Orla Brady(Maggie Harper), David Sibley(Julius Rotfeld), Simon Paisley Day(Grigory Markoff)