Perhaps Fritz Lang's most neglected major work, this stunning silent German thriller (1928) both summarizes and refines his first Dr. Mabuse film while introducing some of the principles of editing continuity found in M. Scripted by Thea von Harbou (Lang's second wife), it pits a government agent (Willy Fritsch) against a wheelchair-bound international banker (Rudolf Klein-Rogge) whose spy ring is stealing classified documents, and its fanciful and imaginative approach to the thriller form clearly inspired both Alfred Hitchcock and Thomas Pynchon. This restoration of the 175-minute German release is almost twice as long as the much more common version released for export, yet Lang edited both of them, and each has glories of its own. Erotic, mysterious, abstract, full of uncanny images and ideas, and rich with multiple identities and intrigue, this is essential viewing for anyone interested in the great director's work. With Gerda Maurus. A 35-millimeter print will be shown; David Drazin will provide live piano accompaniment. Gene Siskel Film Center, 164 N. State, Wednesday, November 15, 6:15, 312-846-2800.