When a car plummets into a remote lake in British Columbia with a five-year-old boy trapped inside, a group of strangers must spring into action to save him:

John resurfaced for air. By now Mark had manoeuvred the boat and was tossing life jackets to a few bystanders floundering in the lake. John went under again and discovered the car doors were jammed shut. He then decided to try the back hatch. He had been underwater for scarcely a minute but already felt depleted—another reminder that a lifetime of smoking was catching up to him. Camping gear floated out of the trunk as John released the hatch and struggled to remove non-buoyant items. Then, with his eyes burning from the cold water, he glimpsed an image he’ll never forget: Rowan’s blond hair, waving in the water, his limp arms suspended overhead.