"a woman called Valerie Kay"

 

Vera Atkins
Public DomainVera Atkins - Credit: James Day

The character of Valerie Kay may be based on Vera Atkins (1908-2000), who managed the women operatives for the SOE.  After the war, she dedicated herself to investigating the fate of the 118 SOE agents who went missing in France.  She was successful in all but one case.    Vera Atkins - Her Story