All Grace Bauer has wanted to do since she was a child was to fly airplanes. When the Women Airforce Service Pilots (WASP) organizes for female pilots to ferry new bomber aircraft to stateside military bases, Grace applies. She never tires of flying B-17s and other aircraft, and dreams of being one of the first females to pilot a commercial airliner after the war.
A life-threatening illness clips her wings, and she finds herself back home in Wisconsin, thinking that God is punishing her for a past sin. Bored, she joins a ladies bowling league and meets Mac McAlister, a widowed school teacher who helps out at the bowling alley on league nights. He offers to help her restore the old family lakeshore estate, Safe Refuge-now called Rose Harbor and lost during the Crash of 1929-back to the family. She's happy to have a good friend like Mac to help. But despite her efforts to keep their relationship platonic, Grace's feelings for him grow. Before the relationship can move to the next level, she must tell him her secret, and when he hears it, he'll want nothing more to do with her. She should end the relationship, but can't imagine life without him. It is only with God's blessing that she'll be free to love Mac. But after what she's done, she doubts God is willing to forgive her.