Case Book of Ellery Queen (1945)
The five Mercury paperback series normally contained "cut" or "abridged" versions of popular novels, including several of EQ's. This being the only collection to feature "new" material -- even if the works were "new" only in a technical sense. Since the radio scripts were written by Dannay and Lee, this paperback collection is of interest to EQ collectors. "The Double Triangle" is by no means a great Queen story but since it combines many of the earlier Queen-characteristics it proves a source of fascination in itself. Like all of the Mercury editions, though, it is difficult to find.
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