Ah yes, the mysterious ghost who Helene broke the ghost rules for! The one Cyrus has been asking about for a while now. We finally get the answer - it's Veld, the ghost who lives at Cyrus's house and is Cal's friend! I hope you all feel quite edified knowing the answer to that pressing question. 

...You want to know why Helene broke the ghost rules for Veld? I guess that's a mystery for another day ;)