When Adrian inherits his aunt Clarissa's charming bookshop, La Libreria, in the heart of Rome, he expects a simple life of books and quiet days. Instead, he steps into a world of mystery and danger.

As he adjusts to his new surroundings, Adrian discovers that Clarissa was the leader of a secret club dedicated to solving real-life mysteries. Her latest investigation into a powerful and dangerous organization, La Mano Nera - The Black Hand, has left her dead under suspicious circumstances.

Determined to uncover the truth behind his aunt's death, Adrian teams up with his late aunt's loyal and eclectic staff—Valentina, a mystical palm reader; Marco, a quirky book enthusiast; the enigmatic, handsome Italian, Luca, and Micio, the cat, whose intense gaze never leaves Adrian. Together, they unravel a web of secrets hidden within Clarissa's meticulous notes, facing off against a ruthless enemy willing to kill to keep their secrets buried. As Adrian delves deeper into the mystery, he finds himself drawn to Luca, despite Luca's insistence on keeping things professional. With danger lurking around every corner and trust hard to come by, Adrian must navigate his growing feelings while piecing together clues that could put him directly in the killer's crosshairs.