The Spy Who Loved Ice Cream (Spy Penguins, Bk. 2)

Jackson and Quigley were this close to joining the FBI, until Jackson's mom found out and they ended up grounded instead. But at least they have Uncle Bryn's birthday party to look forward to. Yet when they get to the ice cream parlor, Jackson and Quigley quickly realize that something has gone very, very wrong, and Uncle Bryn is now suspected of being a master thief! Can Jackson and Quigley solve the case before Uncle Bryn is locked away forever?