(This is you, Luna, right? Just making sure)
ANYWAY awesome! And yay, hey Knight! Okay, ideas.
1) Maybe let these three agree to team up and use their separate abilities to track the murderer. Scent, smarts, agility... whatever! Maybe make them discover a secret hideout of said murderer? Maybe even discover an association of wolf assassins? IDK!
2) Make Luna + Gemmy tell the fox parents... but then again, Gemmy has deserted them and Luna has left. Maybe instead, these two go find a place to sleep and mull over the secret they uncovered. perhaps Luna can tell Gemmy more about the history of Luna's pack and stuff, maybe a rebellion.
3) Maybe add some mythical or magical wolf or fox spirits to guide their way (like in Ora'cle). That way, there can be some cool magic and stuff!!!
I really like it so far!