An Unexpected Love (Heartsong Presents)

is book #279 of the Heartsong Presents line.
==Book Description==
Nurse Lorenna Fields always took her job at Chicago's Lakeview Hospital seriously, determining never to becomes personally involved with her patients. Then a mysterious man with eyes like onyx is admitted after a shipwreck on Lake Michigan. He has lost his memory and sight. Renna feels a special kinship with this man and soon dubs him Mr. Blackeyes. They build a strong trusting friendship, and she shares her faith in the Lord. But she dreads the day he will recover. His memory will take him away from her to family and friends now forgotten, and his regained sight will reveal a secret about herself that Renna has been trying hard to hide. Renna cannot stand the thought of Mr. Blackeyes looking at her in disgust. Soon it will be time for her to leave before his sight returns. His memories of children and a fiancée are already surfacing. But someone else besides Renna doesn't want Mr. Blackeyes to remember the past... and may not allow him to live to see the future. 
(Description from paperbackswap.com)