Jimmy Bishop likes crime fighters, vampires, and dogs, and he does not care for his new babysitter, so he is delighted when his new dog, Abby--who sleeps during the day, and grows huge fangs at night--turns out to be a crime-fighting, vampire dog, who also does not like the babysitter

No one fights crime harder than the Crimebiters gang... and of course my crime-fighting dog, Abby. Together, we've fought against corruption in the world of elementary school sports and even stopped a neighborhood crime ring! But now a copy of the final math test has been stolen, AND our local animal shelter (where I found Abby!) is in danger of closing. As if that weren't enough, Daisy has introduced her new kitten, Purrkins, into the Crimebiters...