Amanda Lester and the Pink Sugar Conspiracy

A reluctant detective, a criminal mastermind, and . . . sugar?
Amanda Lester wouldn't be caught dead going into the family business. Her ancestor, Sherlock Holmes's colleague Inspector G. Lestrade, is a twit. Nevertheless her parents refuse to see his flaws, and she's going to a secret English school for the descendants of famous detectives whether she likes it or not.
When Amanda arrives at the dreaded school, she considers running away-until she and her new friends discover blood and weird pink substances in odd places. At first they're not sure whether these oddities mean anything, but when Amanda's father disappears and the cook is found dead with her head in a bag of sugar, they're certain that crimes are taking place.
Now Amanda must embrace her destiny and uncover the truth. The only snag is that arch-villain Blixus Moriarty, a descendant of Holmes's nemesis Professor James Moriarty, might be involved, and he doesn't like nosy little girls interfering in his business.