Jimmy is sure that his dog, Abby, is special. After all, it was Abby who helped nab the criminal Barnaby Bratford. Jimmy's parents, on the other hand, are starting to feel like Abby is one destructive little dog and they insist on enrolling Abby in obedience training. The only problem is that the longer Abby's in class, Jimmy's superhero crime-fighting vampire dog is slowly becoming just like every other dog. At the same time Jimmy's friends, the Crimebiters, are realizing that there's just not much crime to fight in their tiny town. But when Jimmy joins the lacrosse team and mysterious things start happening on and off the field, the Crimebiters realize that Abby better get back to her crime-fighting ways and fast.