A dead Santa Claus in a garden centre grotto. Underground fighting in the dark corners of the Highlands. Can Macleod and McGrath discover who is dispatching the strongmen of the ring in such a festive fashion?

With Hope McGrath struggling to regain her confidence after a disfiguring injury, Macleod must encourage his protegee as they seek to discover the link between Grotto strangulations and an underground fighting promotion. But as the snow starts to fall and Yuletide celebrations turn sour, Macleod must look beyond the lights and fanciful characters to find the real murderer in their midst.

Ho-Ho-Ho! This time, Santa better watch out!