Sinister "accidents" threaten the Tour de Rock, a thousand-kilometre cycle ride to raise money for children's cancer. Spurred on by her young nephew's leukemia, RCMP Corporal Danutia Dranchuk has signed up as a rider but soon finds herself investigating. Events take a startling turn when people close to Danutia become caught up in a web of speculation and murder that she seems powerless to untangle.