The Sky Thief

You'll find this mystery on the border of Suthsexe and Cent, just south of Tonbridge Monastery. Look for a girl sitting way up high in a tree.

Chat with her, and she'll tell you a bird snatched her mother's ring. She needs your help to get it back.

The ring is in a bird's nest in the tree directly across from the girl. You can't climb that tree, so you'll need to stand under the nest and shoot it. Aim your bow upwards and fire to knock the ring down.

Once you've got the ring, the girl's step-mother will show up. You'll have a choice: give the ring to the girl or her step-mother.

Honestly, the game says the choice has no real consequence, but returning it to the girl seems like the kinder option.

After you've made your decision, chat with the girl one more time to wrap up this mystery.