A Deadly Few. Shadows of War, #8

As desperate battles rage across the skies, one woman stands between a spy and his plans. Evelyn Ainsworth has had enough. While enemy forces prepare for invasion, the spy known only as Henry has become more than a nuisance. After a close call puts her life at risk, she takes matters into her own hands. But Henry has also had enough, and only one of them can survive. The pilots of the RAF are exhausted.
Losses are high, they're out of reserves, and Hitler's Luftwaffe is poised to claim victory. Acting Squadron Leader Miles Lacey is ordered to take his pilots south, into the heart of the fighting. But despite their eagerness to make a difference, the battle for survival quickly takes its toll. As the RAF struggles to prevent a Nazi invasion, it's up to Evelyn to uncover a traitor and stop him once and for all.
While the rest of the world watches, the very fate of Great Britain, and of freedom itself, rests with them.A deadly few.