You unlock this quest after meeting Reda, the Thousand Eyes merchant, that is, after completing the "The Thousand Eyes" quest.
Reda is looking for help to grow the Thousand Eyes network and expand his influence across England. He is a generous merchant and knows how to greatly reward his associates.
Speak to Reda or the Thousand Eyes merchants throughout England to get new contracts. Usually they will have a few time limited quests for you to complete. These are generally quick and easy jobs like find and kill a merchant, kill the predators, etc. Once you complete them within the time limit, the contract will be fulfilled.
When you have completed 10 contracts return to Reda to inform him about this. The quest will end and you will receive a reward from him, a shield - Rune Shield.
