Missing You by Harlan Coban

Publisher's Weekly Review:

An unlikely bond develops between NYPD detective Kat Donovan and 19-year-old Brandon Phelps in this page-turning, stomach-churning standalone from bestseller Coben (Six Years). While exploring a dating site called YouAreJustMyType.com, Kat discovers the photo of Jeff Raynes, her ex-fiance, who dumped her 18 years earlier. Brandon's widowed mother, Dana Phelps, has also met someone from that site and is now missing. Several puzzles emerge. What happened to Jeff? What is happening to Dana? What is the real story behind the murder of Kat's cop father, Henry Donovan, years before? Who is Titus Monroe, the man pulling the strings on the dating site? Coben orchestrates his story perfectly as Kat begins to sense the magnitude of horror at work and Titus becomes aware of her investigation. Once again, Coben has brilliantly used a current trend, in this case Internet dating, to create a can't-put-it-down thriller.