All These Things I've Done, by Gabrielle Zevin

What if we lived in a time when caffeine and anything made with caffeine was illegal contraband?  Heaven forbid-I could not live without my tea and chocolate!!!  But this is the setting for our story: a world where the crime lords smuggle caffeinated food items from place to place.  Anya Balanchine is the teenage daughter of the Russian mafia’s now-dead boss, and she is trying to live as normal a life as possible in addition to taking care of her two siblings and passing high school.  But sometimes relatives just don’t leave well enough alone, especially when she is the perceived heir to the Balanchine legacy, and she finds herself entangled in her extended family’s doings.  Throw in the interesting new boy at school whose father happens to be the new assistant District Attorney (and intent on dismantling the big caffeine criminal organizations), and you’ve got yourself a quirky, fun read!  For ages 15 and up.