Catsup High by Margaret Ryan

Vacancy for assistant cat detective - must be hard working and not eat much, special powers an advantage.

When cats in the little town of Catsup go missing, cat detective, Malarkey, hires an assistant to help him find them, but the new kitten cop has a mind of his own.
Can the pair of them work together to catch the catnappers? Find out in the first adventure for the Catsup high detective agency.