Clue number 1:
Our hero was blinded in the war.
Great to see this post, Christie.
Clue number 2:
Heroine is being paid by the hero's father to be his nurse.
And yes this is a historical.
I knew it would be an historical...lol.
Our heroine is not normally a nurse not matter what her references say. But she still teaches him how to accept his blindness and is willing to stay with him, until his sight starts to return. Then she must leave or be caught in her lie.
This book reminds me so much of a Barbara Courtland I read years and years ago.
Well crimey, you've got me flummoxed...lol.
How about "Taming Lord Renwick"
Nope, that's not it.
Authors initials TM
"Yours Until Dawn" by Teresa Mederios?