I got into CJ Daugherty's books while reading the Harper McClain mysteries (excellent, by the way!). Number 10 was the first YA book I'd read from Daugherty, and I've been waiting eagerly for the sequel since I binge-read Number 10 in one weekend. Codename Firefly does not disappoint! This time around, I needed to experience it through Audible books, as I have a long commute to work. I've never been so happy to sit in traffic. I must be an old romantic because my favorite parts were Gray's swoon-tense scenes with Dillon. If you or your teen haven't read CJ Daugherty yet, you absolutely should.