Mimi Lee is on top of the world. She has a thriving pet grooming business, the sweetest boyfriend, and a talking cat to boot. When she arrives at the elementary school where her sister, Alice, works, she's expecting a fun girls' night out - but instead finds a teacher slumped over in her car, dead. When Alice becomes a main suspect it's up to Mimi, her sassy but savvy cat Marshmallow, and a cute kitten named Nimbus, to get to the bottom of yet another case before her sister gets schooled.