What Was Lost by Catherine O'Flynn (2007)

Amazing first novel about about a young British girl who goes missing many years ago, and the way her disappearance affects people several years in the future, including the boy who was accused of being involved, and a security guard at the mall. Along the way, it's also an interesting look at mall culture and life, and retail life, and people in general. And everything in the story unfold so beautifully. I swear I gasped a couple of times. Really amazing and hard to describe.