It's the Fiesta de San Juan in Spain, the national celebration of the Summer Solstice, and there's much excitement about a huge firework display in the village of St Marti. But Primavera Blackstone is more inflamed by the appearance of a mysterious writer, Duncan Culshaw, who is determined to rake through the ashes of her past. And when extortion and blackmail are mentioned, Primavera realises the heat is on. Duncan has his fingers burned, playing fast and loose with the fiercely protective Prim, but when he marries a dying woman for her money, threatening the inheritance of Prim's son Tom, things are going to get explosive.