Dead Girl Dancing, by Linda Joy Singleton
Julia's Kitchen, by Brenda A Ferber
Secret Keeper, by Mitali Perkins
The Serial Garden: The Complete Armitage Family Stories, by Joan Aiken
Winnie's War, by Jenny Moss
Shadows In The Jungle: The Alamo Scouts Behind Japanese Lines In World War II, by Larry Alexander
Alexandria, by Lindsey Davis
Any Which Wall, by Laurel Snyder
Killer Pizza, by Greg Taylor
Jake Ransom and the Skull King's Shadow, by James Rollins
When the Whistle Blows: The Story of the Footballers' Battalion in the Great War, by Andrew Riddoch and John Kemp
The Last Thing I Remember, by Andrew Klavan
Going Bovine, by Libba Bray
Operation YES, by Sara Lewis Holmes
Shelter Me, by Alex McAulay
Stonewall Hinkleman and the Battle of Bull Run, by Michael Hemphill and Sam Riddleburger
Fat Cat, by Robin Brande
The books I recommended but they didn't order were The Year We Disappeared: A Father-Daughter Memoir, by Cylin Busby and John Busby*, Tarantula Tide, by Sharon Tregenza, Damsel, by Susan E Connolly, Kitchener's Last Volunteer, by Henry Allingham and Dennis Goodwin, and Dead Girl in Love, by Linda Joy Singleton*.
I also recommended A Wizard of Mars, by Diane Duane, and Tell Me a Secret, by Holly Cupala, which were supposed to have been released in 2009, but publication has been delayed until this year (so I'm not including them in the total).
Amazon.com links are provided for information, but buying from your local independent booksellers is strongly recommended!
* They did buy these two, but apparently not as a result of my recommendations.