One night in November, a fire rages at the Enge marina in the middle of Zurich. As the flames are extinguished, Rosa Zambrano – an officer with the water police – finds the charred corpse of a young woman. Why did Iva Schwarz, the daughter of a renowned architect, have to die?

Amid the twists and turns of the investigation, the former love of Rosa’s life, Leo, turns up in Zurich once more – suddenly appearing in her enchanting garden in the old part of town. Yet he is not the only ghost from the past that is haunting the city.