There are 3 books in the The Milkweek Triptych series. The newest book is Necessary Evil which came out in 2013.

1
Bitter Seeds

Book cover of Bitter Seeds
Raybould Marsh is a British secret agent in the early days of the Second World War, haunted by something strange he saw on a mission during the Spanish Civil War: a German woman with wires going into her head who looked at him as if she knew him. When the…
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2
The Coldest War

Book cover of The Coldest War

For decades, Britain's warlocks have been all that stands between the British Empire and the Soviet Union - a vast domain stretching from the Pacific Ocean to the shores of the English Channel. Now each wizard's death is another blow to Britain's national security.

Meanwhile, a brother and sister -…

3
Necessary Evil

Book cover of Necessary Evil

The history of the Twentieth Century has been shaped by a secret conflict between technology and magic. When a twisted Nazi scientist devised a way to imbue ordinary humans with supernatural abilities - to walk through walls, throw fire and see the future - his work became the prized possession…