20. Missing You- Harlan Coben
Centers around a 40 year old female cop whose police office father was murdered at the same time her fiancee left her 18 yrs ago. She sees the fiancee on an online dating site and 500 pages of genuine thriller ensue. Many twists of plot, captivating. I literally couldn't put it down and stayed up WAY past my bedtime to finish it.
Couldn't recommend it more highly.