Issue Detective 564
Subtitle Double Crosses (also contains the Green Arrow / Black Canary story "This Masquerade") 
Date July 1986
Writer(s) Doug Moench
Artist(s) Gene Colan, Bob Smith
storyline (continued from Batman 397) 
Batman used Circe, Black Mask's former girlfriend, to try and set up Harvey Dent. He staked out what he suspected would be the next target - a brewery. Two-Face trapped him in a vat of beer. Catwoman, disguised as Circe, saved the Dark Knight. She left him in a huff. 
(continued in Batman 398)