Detective Comics #630 1991

In Detective Comics #630, Batman pursues Saul “Stiletto” Calvino, a contract killer with persuasive abilities who has escaped Death Row and is seeking his hidden money in Gotham. The Dark Knight also encounters Two Tone, a pair of conjoined twin hitmen. The investigation involves a cipher hidden within a book about stiletto heels and an FBI agent's machinations. The issue features the death of Bud “The Seventh Seal” Brown and later, the demise of Two Tone. It is a notable standalone story by Peter Milligan and Jim Aparo.