Kat is just crazy about puppies. Together with her best friend Maya, Kat helps out at her aunt's pet grooming shop where she plays with and walks Murphy, a shy Sheltie puppy. When Kat befriends Grace, the quiet new girl in class, it quickly becomes apparent that Grace and Maya don't get along, though Kat can't seem to figure out why.

Can Kat keep both her new friend and her best friend, and can Murphy help the girls solve the mystery of a lost dog?