The invisible writing
By: by Arthur Koestler.
Edition: 1st. American edition.
Series: The Danube edition
Publisher: Macmillan
Published: 1970
Place of publication: New York
Number of pages: 526
Notes: The second volume of an autobiography, 1932-30; v 1. has title Arrow in the blue.

Originally published in 1954, reprinted with author's Note to the Danube ed.