This Wednesday I'm Waiting on: United We Spy by Ally Carter
Cammie Morgan has lost her father and her memory, but in the heart-pounding conclusion to the best-selling Gallagher Girls series, she finds her greatest mission yet. Cammie and her friends finally know why the terrorist organization called the Circle of Cavan has been hunting her. Now the spy girls and Zach must track down the Circle’s elite members to stop them before they implement a master plan that will change Cammie—and her country—forever.
-summary and cover via Goodreads
The Gallagher Girls series were some of the first YA books I ever read and they are still my favorite series. I am so exited for the last one, though I'm sad too because... well.. last one! but I'm sure it will be as good as the rest of the series though!