This was a charming piece, read actually a while ago, so if something's kind of vague, blame my procrastination.
Luna, the main character, is currently 15 or so. Her mother, a model but called the "anti-pinup" is dead, and her father and brother (and uncle in Italy) are all she has left (plus that cello-playing boy next door. Who seems to be a Gary-Stu, if you ask me). She finds her mother's phone, which, as the title says, has seven messages, which open up the mystery of her mother's death. All the while, she's making hundreds of dollars selling her photography and making friends with actors. Gosh.
I did like the character profiles. They were a bit skewed and generic, but at least they were consistent. There were some interesting characters, and it was fun to read about their little quirks.
The plotline could have been better, though. It was nice, but not something you could enjoyably read for years, dozens of times.
Overall, I dub this book to be a raisin cookie (and a 3.6/5). Interesting the first time you taste it, but you never really want to eat it again. Points that are simultaneously fun, gross, and flat at the same time. You can say "broccoli cookie" if you like raisins.