He had his own book back in the 80's. It's one of the few DC characters I'm familiar with because it was published in the GREAT, anthology-styled magazine Thriller here in sweden (a book that also included V for Vendetta and Chaykins Blackhawk) and, later, as a back-up comic in Batman. It's definitely worth checking out-dark, "noir" type stories by Dennis O'neill and good art... BTW, the character was, apparently, originally invented by Steve Ditko (of spiderman fame) in the late 60's but never took off...