At a resort and urban complex in Oropesa del Mar, on the Levantine coast of Spain, Inspector Almanzor is ordered to investigate the death of Malory, an Irish tenant who was in a private hot tub with her husband Brendan. While not rejecting the hypothesis of suicide due to the lack of prints, the police team engages in a case in which the only clue is the presence of dry ice or carbonic snow in the water. The substance is normally...