There's Always Tomorrow (Heartsong Presents) (Mindrup)

is book #1041 of the Heartsong Presents line.
==Book Description==
Adrella always noticed him.
Everyone took notice of the handsome lighthouse keeper when he visited the mainland. Especially shopkeeper's daughter Adrella Murphy. But the enigmatic man never said a word to anyone. When Adrella is stranded with him on an isolated island during a storm, will she give up her dreams of true love and marry him to save her reputation?
As a doctor in the Civil War, Dathan Adams saw too much suffering, and he withdrew from the world to his beloved lighthouse. Now a hurricane forces a spirited Irish lass into his care. To stay alive, he must set aside his solitude and work side by side with Adrella. When her strength and faith erode his defenses, a tragedy might just yield unexpected love. 
(Description from fictiondb.com)