Brooklyn bookstore owner Darla Pettistone and her oversized black cat, Hamlet, have solved a few complicated capers. But after a recent brush with danger, Darla needs to get Hamlet out of a feline funk... Lately, Hamlet hasn't been chasing customers or being his obnoxious self--something Darla surprisingly misses. Concerned, she hires a cat whisperer to probe Hamlet's feline psyche and then decides to get out of her own funk by taking up karate to...