Tough Customer by Sandra Brown

Dodge Hanley is a private investigator who doesn't let rules get it in his way That's why he's the first person Caroline King - who after a thirty-year separation continues to haunt his dreams - asks for help when a deranged stalker attempts to murder their daughter ...the daughter Dodge has never met. He has a whole bagful of grudging excuses for wishing to ignore Caroline's call, and one compelling reason to drop everything: guilt. His daughter Berry has become the object of desire of a co-worker, a madman and genius with a penchant for puzzles and games who had spent the past year making Berry's life hell, and who now has vowed to kill her. The heart-pounding situation goes from bad to worse when the stalker begins to claim other victims and leaves an ominous trail of clues as he lethally works his way toward Berry. From the acclaimed international bestselling author Sandra Brown, Tough Customer, is a thrilling tale about obsession and murder, the fragile nature of relationships, and, possibly, second chances.