In his eleventh novel, Tim Powers takes his unique brand of speculative fiction into uncharted territory, instilling the old-fashioned espionage novel with a healthy dose of the supernatural.

As a young double agent infiltrating the Soviet spy network in Nazi-occupied Paris, Andrew Hale finds himself caught up in a secret, even more ruthless war. Two decades later, a coded message draws Professor Andrew Hale back into Her Majesty's Secret Service. Elements from his past are gathering in Beirut, including ex-British counterespionage chief and Soviet mole Kim Philby, and a beautiful former Spanish Civil War soldier-turned-intelligence operative, Elena Teresa Ceniza-Bendiga. Soon Hale will be forced to again confront the nightmare that has haunted his adult life: a lethal unfinished operation code-named "Declare." From the corridors of Whitehall to the Arabian Desert, from post-war Berlin to the streets of Cold War Moscow, Hale's desperate quest draws him into international politics and gritty espionage tradecraft—and inexorably drives Hale, Ceniza-Bendiga, and Philby to a deadly confrontation on the high glaciers of Mount Ararat, in the very shadow of the fabulous and perilous biblical Ark.