Detective Murdoch and Dr. Ogden travel to Vancouver Island to visit Murdoch's brother, RCMP officer Jasper Linney. There, they investigate a murder connected to an archaeologist who has uncovered an ancient Indigenous settlement, leading to encounters with the Songhees and Haida nations. Meanwhile, the Brackenreids are offered an investment opportunity that may not be all it seems, and Crabtree and Higgins plan a ski holiday with their sweethearts Nina Bloom and Ruth Newsome that may be more dangerous than expected.
An avenging angel strikes down a Russian Chess player. A Polish emblem is found on the dead man. Crabtree goes under cover as a chess player but his moves are actually being orchestrated by another. They are not the only ones playing deviously as the Russians and Poles compete outside the tournament.
After a tragic loss a visitor with an urgent request arrives at the Murdoch home. William and Julia, with the help of their colleagues, must put their own feelings aside to help their friend avoid the noose.