Three months ago, Jenna was supposed to meet her lifelong friend Celia. But when Jenna arrived late, she found that Celia had disappeared, and hasn't been seen again. The only piece of evidence is a lone diamond earring found where they were planning to meet. And even though Jenna has obsessively surfed message boards devoted to missing persons cases, she is no closer to finding any answers. But when her son's new girlfriend disappears too, long-buried secrets finally come to light and a stricken Jenna begins to unwind the tangled truth.