There is darkness at the heart of the Wild Pack. Whisper is dead -- and Storm is certain that his wounds could only have been inflicted by another dog. Storm doesn't want to believe that one of her Packmates could have done such a vicious thing. But as she wrestles with her suspicions in the light of the Sun-Dog, at night Storm is haunted by terrifying dreams -- visions of fear and shadows that guide her paws through the forest while she sleeps. Lucky believes a nearby group of foxes killed Whisper, and the rest of the pack is ready to take revenge. Storm can't stomach the idea of attacking foxes who must be innocent, but she can't blame another dog when she isn't even sure what she's doing on her midnight walks. All she knows is that her Packmates are seeing threats where there are none, while Lucky remains stubbornly blind to the real danger: there may be a traitor in their midst ... and it might be Storm herself.