New York: The Fiction League, 1931. Octavo, pp. [3-6] 7-320 [321-322: ads] [note: text complete despite gap in pagination], original blue cloth, front and spine panels stamped in black. First edition. An early techno-thriller featuring an aerial anarchist who has invented a helicopter and a disintegrator ray. [Reference: Bleiler (1978), p. 172. Reginald 12591. Hubin (1994), p. 709].