Detective Comics, Vol. 1

An ancient mask of a South American god of death is worn by a succession of men driven by it to kill, and Batman must discover the reason why. Manhunter back-up stories begin with the acclaimed offering.

Christine St. Clair, an Interpol agent, seeks a mysterious vigilante called Manhunter, aka Paul Kirk, a former big-game hunter; She learns from a man in Nepal of how Manhunter protected an idealistic anti-tyrant from assassination by a group of clones of Manhunter's, and then leaves, not knowing that the man she spoke to was Manhunter himself in disguise.