The Slaughtered Calf Inn is a location in Diablo III found in New Tristram. It is run by Bron the Barkeep. During the beginning of the game, Leah can be found here. She lives in a room of the inn that can be entered, rather than one in Cain's House.
When the player first talks to Leah, the sick people that are standing in the Inn will turn into Risen that the player has to defeat.
Walking into Leah's room will give you the 'Visit Somewhere Nice' achievement.