My fifth book was the middle-school funfest, The Doublecross (and other skills I learned as a superspy) by Jackson Pearce.
From my review: "This is a book you probably shouldn't think about too closely, what with
its prepubescent spies and I-Spy antics. It's awfully fun once you have
a generous suspension of disbelief. The plot romps along, with plenty
of explosions and gadgets and excitement, as well as humor."
I think I'll take some time for knitting and listening to my audiobook before I pick up my next book.