Max Brand (aka Frederick Faust) published The Phantom Spy as a serial in the pulp magazine "Argosy" in 1937 as "War For Sale". It was reprinted in hardback by Dodd, Mead in 1973. The novel is set in 1930s Europe during the rise of Adolph Hitler. Brand was the creator of Destry (Destry Rides Again) and Dr. Kildare.
Used availability for Max Brand's The Phantom Spy
June 1975 : UK Hardback
1973 : USA Hardback
December 1975 : USA Paperback