Where is the werewolf-hunter (Sir What's-his-name)

I've found all three boys - but I can't deliver the third ring (Geth's) to the cleric in Tyr's Temple

I've also cleared out the werewolf den and found the note

can't return to temple?...

You should just use the recall stone to get back to temple...

In the werewolf den you should find the note point to a particular residence in Port Llast. You need to talk to the cleric inside the temple, he will ask you to kill the werewolf.

To be simple, the werewolf is in one of the house in Port Llast. However, he won't be there unless you return to the cleric and tell him who the werewolf really is. I think you need to get the dairy from Sir whatever in the cave south of Port Llast to prove that.

After you've talked to Neurik in the temple, return to Ander and ask him about the Black Wolf. He'll tell you where they went to fight it. Check there for the Sir Karanthis.

Whats with Alheor anyway (the guy who talks to ander in the tavern) his house has lots of bones everywhere and blood.

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alhelaor is the final werewolf. when you defeat and save the first 3 werewolfs and you come to karathis he will give you his journal on how alhelaor is the final one. once that occurs he wont be in the inn talking to andar anymore. he will be in his house finally.