Milkweed Triptych novels

For decades, Britain's warlocks have been all that stands between the British Empire and the Soviet Union. Now each wizard's death is another blow to Britain's national security. Meanwhile, a brother and sister escape from a top-secret facility deep behind the Iron Curtain. Once subjects of a twisted Nazi experiment to imbue ordinary people with superhuman abilities, then prisoners of war in the immense Soviet research effort to reverse-engineer the...