The Twisted Tree in Assassin's Creed Shadows is a set of missions and assassinations you need to do in order to get Ujisama to join your cause before you can target 'The Fool' Shinbakufu.
Finding the Merchant in the Twisted Tree quest in Assassin's Creed Shadows is the first information gathering quest you can do on this multi-quest chain. Speaking to the Merchant is the main task ...