Enjoyable summer mystery read for younger teens

Enjoyable summer mystery read for younger teens. The lifestyle of the characters is completely unbelievable, but I think the intended age group will find their personalities relatable & have fun with the exciting events depicted therein. The relationships are also more or less realistic for a high school audience - fraught with drama, but what isn't during those years? Has some elements of & would be fun for those who enjoyed One of Us is Lying, Pretty Little Liars, Gossip Girl, etc. The mystery is not particularly predictable & readers will enjoy trying to figure out what is going on. Note that smoking is depicted as a casual, fun activity & this book may therefore not be advised for those who are impressionable.