La Mystérieuse affaire d'Echo Falls

This was a very charming book, though I don't know why I particularly liked it so much. The protagonist (Ingrid) is a schoolgirl whose hero is Sherlock Holmes and she gets caught up investigating several strange events around the town of Echo Falls. To add to the drama, her brother is using steroids and her dad's job has become precarious. It's a really nice YA mystery novel and I'd like to track down the first in the series.