Darkest Fear

This is an okay book written by Harlan Coben. After receiving an unexpected visit from his ex-girlfriend, sports agent Myron Bolitar discovers that he fathered her thirteen-year-old son Jeremy, who is dying and in need of a bone-marrow transplant. Now, Myron must track down the potential donor who has gone missing, and in doing so, encounters several shady characters.

This is the seventh novel in the series.