I really enjoyed reading this just like I did with The Duff. It got a half star more as the characters felt more real, and Sonny was a funny protagonist. 
 Sonny's best friend is Amy Rush, who is the younger sister of Wesley Rush, a main character in The Duff. This is set a couple of years after, when Sonny and Amy are seniors at Hamilton High and Bianca and Wesley are at college together. Wesley and Bianca appear a couple of times in the book, with Wesley giving some advice to Sonny and it was really cool reading about them again. 
 Throughout the novel, Sonny does lie a lot (though understandably so, and hence the title), and in the end this gets her into a lot of troubles. The character development and growth of not only Sonny but also Amy, Ryder and even her dad was great to see. 
 By the end, everything is wrapped up nicely. Sonny has family problems, friendship problems, problems about her future and with Ryder and they are all resolved. Both this book and The Duff were different high school stories, in that it didn't really focus on high school and more on real life morals. 
 Overall, another quick, fun read from Keplinger and a great addition to the Hamilton High books.