Dale Kinsall thinks he's pretty much adjusted to his new home—to the eccentric nature of his clinic staff and to the altitude and climate of the high desert. He's even gotten used to being known as the veterinarian who solved the eco-murders.

But that fragile sense of stability vanishes overnight. Contractors turn the clinic upside down, fellow vet Laura's nephew is deathly ill, and then Laura herself is hit by the same feared virus—even as Dale is the victim of a brutal and mysterious attack. Dale can't believe it's all coincidence... but everyone else pretty much thinks he's nuts.

Everyone but Sully the Beagle, that is. He's an expert mouser and experienced tracker. He can tell there's trouble brewing for Dale and Laura—because, after all...

Sully knows the scent of danger.