This quest begins immediately after Family Matters. Make your way to the docks from the longhouse, where your foster-brother Sigurd has just arrived home after two years away. After greeting Sigurd at the docks, walk with him back to the longhouse. After the cutscene, listen to Sigurd’s tale from the table. After a while he will beckon you over to him, at which point you can choose to go there immediately to progress with the quest. However, you can also take some time to speak with Styrbjorn, Randvi, Hytham, and Basim. When you’re ready, speak with Sigurd and go through the linear dialogue options. He’ll tell you a little more of Basim and Hytham, and then present you with a special gift: the hidden blade of the Assassins.
Follow Sigurd, Basim, and Hytham outside, where they will take you through the basics of learning how to wield your new blade. As with previous AC titles, this will essentially become your main means of assassination. While Basim is eager for you to use the blade, Hytham is more reserved, with questions of your intentions. Listen to Basim’s instructions and use the blade to take out targets from different positions. You’re taken through a basic assassination in plain sight, an attempted assassination of a more powerful target, a ledge assassination, and an assassination from above. When you’re done, speak with Sigurd and walk to the docks to complete the quest.