An Ice Cold Grave is the third Harper Connelly book by Charlaine Harris.
Harper Connelly learns that a group of six boys are missing and presumed dead. After meeting the grandfather of one of the boys, who is also the sheriff of the town, she uses her ability to view the last memories of the boys. She learns that there were not six boys, but eight. Why would the town lie about this, and what happened to the boys? Harper makes it her goal to find out.