What is the main conflict in Darkest Fear by Harlan Coben?

Darkest Fear, written by Harlen Coben, details the search by Myron Bolitar for the missing bone marrow donor of his biological son, Jeremy Downing. Myron is drawn into the search for the mysterious donor when his first love, Emily Downing, arrives with the news that his son is dying and needs a bone marrow transplant. Myron is reluctant to become involved with Emily, as his past with her and her husband Greg had been life altering for him. Emily reveals that Myron is the biological father of Jeremy; that he was conceived the night before he wedding to Greg. Myron is still reluctant, and now also angry, but agrees to help Emily find the donor.