Vespers Rising by Rick Riordan, Peter Lerangis, and Gordan Korman

Vespers Rising by Rick Riordan, Peter Lerangis, and Gordan Korman is an action adventure book aimed at young readers. It is the eleventh book in the series, but I didn't feel lost as I listened to it (I listened to the audio book) despite not having read the others. The Cahill family has been at odds with the Vespers (and with each other) for centuries. The Vespers, a secret organization, have been looking for the 39 clues in order to take over the world, and the Cahills have been working to protect them. Amy and Dan, the modern day protagonists are working to stop the bad guys. But will they succeed? Being in a series, the book ends with some questions answered, and others not. Young readers who enjoy books in a series and clues to follow will likely enjoy this book. Vespers Rising was published in 2011.