Code Name: Lise
by Larry Loft

Jim says,

A spy story set in World War 2, it highlights the challenges, dangers and drudgery of a woman spying for Britain against the Nazis. Ilse has a family with children, and her story begins with training in the skills needed, continues with the dangerous courier missions and rescues that she gets involved in.

The story is especially gripping when she is captured and tortured by the Nazis. The story does not end with the end of the War.