BACKGROUND TO DANGER. New York: Alfred A. Knopf, 1937. Octavo, pp. [1-12] [1-2] 3-280 [281-284], printed wrappers. Advance copy of the first U.S. edition. Inscribed by Ambler on the half title page to Otto Penzler: "To Otto, enviously, / I've never even seen / this book at this stage -- / Eric Ambler / 21 IX 81." Signed and dated a second time on the title page. Espionage thriller involving military secrets, Soviet agents, German agents and Rumanian oil. Filmed in 1943, directed by Raoul Walsh with George Raft, Sidney Greenstreet, Peter Lorre and Turhan Bey from a script by W. R. Burnett. Some tanning to text paper, spine leaned, small damp stain on front cover at upper right edge and another at upper spine edge, light wear at edges and creasing at corners, a good or better copy. An uncommon advance copy rarely found signed. (#154604).