Detective Comics #89
| Writer | Henry Boltinoff, Don Cameron, Jack Farr, Tex Palmer |
| Artist | Henry Boltinoff, Louis Cazeneuve, John Daly, Jack Farr, Martin Naydel, George Roussos, Dick Sprang |
The theft of a secret typewriter, valueless except to the inventor, leads Batman and Robin to discover the true identity of the Cavalier.
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