The Case of the Case of Mistaken Identity (S & S, 2009) by Mac Barnett. In his first case, Steve Bixton has a national treasure to recover, a criminal mastermind to unmask, and a social studies report due Monday—all while on the run from cops, thugs, and secret-agent librarians.
The Red Blazer Girls: The Ring of Rocamadour (Random, 2009) by Michael D. Beil. Sleuths in school uniforms who decide to help out a weird lady, and end up hiding under tables, tackling word puzzles and geometry equations, and searching rather moldy storage rooms for “the stuff that dreams are made of” (that’s from an old detective movie). There’s a boy who complicates things.
Closed for the Season (Houghton, 2009) by Mary Downing Hahn. Arthur and Logan set out to solve the mystery of a murder that took place some years ago in the old house Logan’s family has just moved into. The boys’ quest takes them to the highest and lowest levels of society in their small Maryland town, and eventually to a derelict amusement park that is supposedly closed for the season.
Creepy Crawly Crime (Holt, 2009) by Aaron Reynolds. A graphic novel has Joey Fly trying to find a stolen diamond pencil box for his beautiful butterfly customer.
The Case of the Cryptic Crinoline (Penguin, 2009) by Nancy Springer. Part of a series, Enola’s landlady, Mrs. Tupper, is abducted, and Enola will put absolutely everything at risk to find her.
Of these, I’ve only read the last title, and I highly recommend it and this series.
Information from School Library Journal “Extra Helping” Online, January 27, 2010.