Critics have praised Bailey for her ability to blend rigorous historical research with a gripping, novelistic pace.

The book centers on , the daughter of Ulrich von Hassell, a former German ambassador to Italy and a key member of the resistance against Adolf Hitler.

Described it as "fascinating" with a talent for bringing historical figures to life.

Under Hitler’s Sippenhaft (kin liability) policy, Fey was separated from her young sons and moved between various concentration camps, including Buchenwald and Dachau.

Called it a "gripping thriller" that uncovers painful family secrets.

Noted it is as "exciting as any work of fiction".

After her father’s execution for his involvement in the failed July 20 plot (Operation Valkyrie) in 1944, the Gestapo arrested Fey.