Falling Stars: The Apprentices

In a different territory, far from the five Clans that we normally see, there lives five more. FlameClan, MistClan, NightClan, CloudClan, and TunnelClan. All five lived in constant battling, TunnelClan being the constant culprit for the start of said fighting. Now it is thought that TunnelClan has caused trouble once again, though they deny this. FlameClan's leader former Greystar believed them and MistClan followed FlameClan to continue their alliance. NightClan and CloudClan disagree, however, and wants to see TunnelClan punished. The culprit is right under their noses, and everycat know this. A couple of pesky apprentices must find out. Is it TunnelClan? Or is it a new threat?