All-Star Western (All-Star Western Vol. 3 #14)

The Black Diamond continues its journey through DC's history as it shows up in 19th century Gotham. Someone has stolen the Black Diamond that Doctor Jekyll uses to create his infamous potion, and he's hired Jonah Hex to track it down! While Hex follows the trail of Gothamites under the influence of a bootleg copy of the potion, Amadeus Arkham must face the mad doctor on his own.