It wasn’t a sentence amateur detective Donna Nightshade thought she’d say when she awoke that morning, but after six long months with no new cases for her Edge of the World Detective Agency, she jumps at the chance to spend a weekend undercover on St Michael’s Mount. With seven high profile attendees – including the Home Secretary – Donna doesn’t expect much tension. But as a storm descends on the tidal island, and they’re cut off from the rest of the world, friends turn to enemies and before the rain has ceased it’s not just one murder Donna has to worry about – it’s two…