Aero and his friends come across Oopa, a young girl from a tribe of Wolf Riders who've settled around Lupine Lake. The tribe possesses a mysterious green gem which is sought after by bandit groups in the area, as well the enigmatic Masked One.
The Lands of Ralosia series takes place in a world with individuals capable of incredible feats of strength, animals of abnormal size, and races of people with distinct anatomy and cultures.
This acts as the 4th entry in the Lands of Ralosia series, but can be read as a standalone short story. There are references to previous events in the series, but they aren't necessary to understand this one.
If you are interested in checking out stories in the series, the one that precedes this is called The Lands of Ralosia: The Tournament
A story that has elements included in this one is, The Lands of Ralosia: Heartstone
Whether you jump right into this one or check out one of the earlier ones, I hope you'll enjoy!