April in Florida and Ben O’Keeffe is enjoying crazy temperatures, working the last few days of a six-month stint with her old law firm. A week later she returns to Glendara, Inishowen where a charity cycle race has been postponed due to heavy rain. So the cyclists stay overnight in the town. But the rain doesn’t stop; it increases to become relentless, torrential. In the middle of the night Sergeant Tom Molloy is called out to Mamore Gap, where a body, dislodged from a high bank by the heavy rain, has fallen onto the vet’s jeep. It is identified as Bob Jameson, a well known local charities boss, and the organiser of the cycling event. Stunned, the local GP confirms that the cause of death was a snakebite. Terrible weather persists and soon bridges are down and roads are impassable. Glendara is completely cut off, with a killer at the heart of the community.