"A Map of the Known World" by Lisa Ann Sandell

Cora's older brother Nate was killed in a car accident, and her grieving family is falling apart. The teachers and students at Nate's old high school take pity on her and she is losing her best friend to the popular crowd. But art class is her escape. Cora has a passion is for making maps -- maps of places she's been and where she wants to go. Her parents don't approve of Cora hanging out with Damian. He was her brother's best friend, and was riding with him during the accident. But Damian seems sincere, so Cora continues to see him behind her parents' back. Her art teacher encourages her to apply for an art program in London and life appears to be improving. As their romance blossoms, Cora learns of a sensitive side of her brother she didn't know existed.