The New Tristram Book can be found on the table immediately as you enter the Slaughtered Calf Inn.
"For many years, villagers were too afraid to settle near the ruins of the cursed town Tristram. But as time went by, adventurers arrived to loot the old cathedral, and their business was profitable enough that New Tristram sprang up to accommodate them. Fewer travelers visit now, though, and the town is mostly populated by craftsmen and farmers." --Deckard Cain