A series of newborn kidnappings and murders near Cumberland, Maryland, catch the attention of the F.B.I.'s Behavioral Analysis Unit. Dr. Spencer Reid finds the case particularly fascinating. It's not just the mind of the killer that enthralls him-but the most recent victim. Her new baby girl was all single-mother Carina Maye had. Losing her to the "Sweet Baby Killer" wasn't easy, but Reid swore he would do everything in his power to get her back.