Something sinister happened that weekend and no-one is telling ...Senior staff at a pharmaceutical company come home with a secret after a team-building course in a remote farm house. Now, they are committing suicide, one by one. Soon, they may all be dead. From an anonymous sender each has received a photo of dogs hanging dead from a tree near the farm. Deciphering the personalities of these high-earning executives and their power structure, Inspector Salgado has his own techniques for making them speak. But Barcelona is now freezing cold and the city is hunkering down in an unusually cold spell. Can Salgado break the ice before it's too late?