Don't Let Go by Harlan Coben

When Nap was a senior in high school, his twin brother, Leo, and Leo's girlfriend, Diana, were killed. Nap's girlfriend, Maura, also disappeared at that time, and fifteen years later, Nap, has no idea what happened to her. Nap is still haunted by the past, so when Maura's fingerprints turn up at the scene of a murder that involved one of their high school classmates, he is stunned and determined to delve in the circumstances of the crime to see if it will lead him to Maura. What Nap uncovers could also help him put his questions surrounding Leo's death to rest.  While I always look forward to a new Harlan Coben book, I felt he had written a story very similar to this before, and that Nap and the plot were just not very interesting.