Cadogan was once an adventurer and a member of the large adventuring party called Her Majesty's Reconnaissance Team. They were tasked by a crazy noblewoman with recovering family items from Netheril. After the noblewoman died, the adventurers kept the profits they acquired.
However, the death of the noblewoman triggered a curse upon the company and they started dying, one each year. In 1370 DR, only Cadogan and two others remained and he was becoming paranoid.