Conch Town Girl by Daniel J. Barrett

Julie Chapman grew up in Key Largo, a tenth-generation Conch, raised in the Florida Keys by her grandmother, Tillie, since Julie’s parents were deceased. Then one night Tillie has a car accident and ends up in a coma, leaving Julie and her best friend Joe to wonder if it really was an accident. As Julie and Joe start digging for the truth, they uncover some dark and desperate secrets that can not only cause them a good deal of trouble, but also cost them their lives.