Location: This quest takes place in Worgen Introduction Gilneas. Follow up on Quest: Brothers in Arms.

Shortly: King Genn Greymane sends you to speak with Josiah Avery.

How to: Travel a little south-west of King Greymane. There you will find a sparkling cellar door. Enter to speak with Josiah. Unfortunately this quest will not end so well.

The Reward is lycanthropy 🙂