The book ‘Whole Lotta Grump’ is written by Cassie Mint. ‘Whole Lotta Grump’ is the 3rd book in the ‘Grumps Unleashed’ series, and it is a romance novella, and the story is about Hudson Katz, a successful but grumpy man, and his masseuse. The story analyzes their unique relationship and the character’s struggle to keep professional boundaries.