Amelia Anne is Dead and Gone by Kat Rosenfield
Can we talk just talk about this gorgeousness for a minute? It's so lovely. Every time I see this cover I remember that I must read that book. It's really simple and clean, and that lets you focus on the few items they've given you to look at: that lovely rose, the dirt-dusted legs, that tilted font. It all comes together to make a beautifully mysterious cover.