Dead Girls Don't Write Letters by Gail Giles
Jazz Reynolds has died in a house fire. But the Reynolds family welcome her home with open arms. Everyone is overjoyed to have Jazz home, everyone except Jazz's sister, Sunny, who is convinced that this girl must be an imposter. She may look like her sister, know everything about her sister, but her real sister is dead...So who is this girl? This is a creepy, taut thriller, where family loyalties shift and secrets are revealed right up until the end...