Snow on the Tulips by Liz Tolsma and published by Thomas Nelson.
In the twilight of the Nazi occupation of The Netherlands, the Germans have taken everything Cornelia had to give, even what was most precious to her. Now Gerrit Laninga-a man who puts God and country above all else-arrives at her house, needing help. She is terrified for herself and terrified for her family, but most of all, terrified of the pain she might feel again if she allows herself to love Gerrit. Her hope is to be free from her paralysing fear.
Gerrit is a known and hunted Dutch Resistance member. When he comes to Cornelia's home for shelter, he's drawn to her strength and kindness. When he asks her to contact the local Resistance on his behalf, she refuses. Gerrit is determined to find a way to continue his underground work without putting Cornelia or her family in harm's way.