No sooner have St. Veronica’s seventh-grade sleuths Sophie, Margaret, Rebecca and Leigh Ann solved the perplexing case of The Ring of Rocamadour (2009) than Sister Bernadette challenges them to find a mysterious intruder who’s cleaning and redecorating the school. Simultaneously, Margaret receives a strange letter inviting her to figure out a series of cryptic clues leading to a missing violin stolen in 1959. Meanwhile, a rare violin vanishes from their friend Mr. Chernofsky’s shop, triggering another mystery. The four feisty detectives use teamwork, brains and aplomb to crack all three mysteries in their Upper East Side neighborhood while juggling homework, starting up a band called The Blazers and outwitting a snarky classmate. Sophie’s chatty first-person, present-tense banter sets a lighthearted tone for their serious code breaking and problem solving, while readers are encouraged to help unravel the puzzles and sample the brainteasers. As they dart from clue to clue, the red blazer gals feel and act like real tweens while tackling everything that comes their way with logic, humor and refreshing savoir faire. (appendix with solution for final logic problem) (Mystery. 8-12)