Some secrets purr beneath the surface… and one clever cat is ready to reveal them. When Violet Pennington inherits her aunt's bookshop in the quaint village of Brambleford, she expects dusty shelves and quiet afternoons—not a mysterious cat with an agenda and a murder during book club. Sebastian Blackwood, celebrated mystery novelist, collapses during the monthly "Murder & Mayhem" meeting, apparently poisoned by his own tea. While the police suspect an accident, Agatha the cat has other ideas. The enigmatic feline begins leading Violet on a trail of hidden clues and buried secrets that someone killed to protect. As Violet follows Agatha's mysterious guidance, she uncovers a decades-old mystery that threatens to tear the village apart. With a killer still at large and secrets lurking behind every cottage door, Violet must learn to trust her unusual feline partner before she becomes the next victim.