The Butterfly Clues by Kate Ellison
After her brother's death, Lo's family copes in various way. Lo's mother relies on prescription drugs and sleep, and her father buries himself in work. Lo's obsessive compulsive disorder gets worse, and she begins stealing small items and hoarding them in her bedroom.
Lo also takes random trips on the bus. One day she ends up in the Neverland area of Cleveland and witnesses Sapphire's murder. Although she did not see the shooter, Lo determines to solve the mystery. During her investigation, she meets Flynt, a homeless artist. A tentative romance develops, but the more Lo learns about Sapphire's death the less she trusts Flynt.
The mystery elements were enhanced by strongly written characters and setting. Lo was an interesting character as she tried to let go of her grief. The book does deal with issues more appropriate for mature teen readers. School Library Journal recommends this book for high school age teens.