The video above is the The Witcher 3 Wild Hunt Reason of State Secondary Quest Walkthrough and shows how to complete Reason of State, the quest featured in The Witcher III: Wild Hunt.
The video walkthrough covers the following objectives:
Meet Dijkstra, Roche, and Thaler in the portside warehouse.
Lure Radovid from his ship.
Kill Radovid.
(Optional) Defeat Dijkstra and his men.
