Detailed Explanation
The killer reveal shattered me. Elliot Ward—Pip's neighbor, her friend's father, a respected local figure—had been having an affair with teenage Andie Bell. When Andie tried to break things off and threatened to expose him, Elliot struck her in a moment of panic. He didn't mean to kill her, but that didn't matter to Andie. What makes this worse? Elliot then let everyone believe Sal Singh killed Andie and then himself. He watched an innocent boy be blamed for murder for five years while hosting neighborhood barbecues.