A New York Times bestseller, Allison Brennan's The Lost Girls features FBI Agent Lucy Kincaid turning up the heat on a cold case...

Photojournalist Siobhan Walsh has been searching for two sisters who disappeared two years ago in Mexico, so when she receives a call from a priest in Texas about an abandoned baby holding a locket with her name, she calls her friends in the FBI for help. The infant obviously belongs to one of the sisters, but how did she end up in Texas? And why did she abandon her newborn?