The corpses of a wealthy couple were found in a chic suburb of Seville: Rafael Vega apparently took the poison himself after suffocating his wife Lucia with a pillow. As soon as Senior Inspector Falcon begins the investigation, he begins to be threatened by Russian mafiosi operating in the city. Soon two more suicides occur. Meanwhile, in addition to the monstrous summer heat, a terrible forest fire is engulfing the area around Seville. Falcon has to work hard to establish a connection between all these events and the dark secrets in Vega's past.