Trickery Treat — Diana G. Gallagher

A portal opened -- as a means for amends,
Leaves a vengeful spirit to roam.
Helping him cross over is the only way,
To restore peace within the home.

It's Halloween, and Piper is busy decorating the Manor, which has become the neighborhood hot spot on the most bewitching night of the year. Meanwhile, Paige decides to use the party as a chance to honor the dead. She casts a spell that creates a portal for a clan of leprechauns...and other wandering spirits.

The guests are thrilled and impressed with the realistic effects, but Phoebe, Piper, and Paige soon realize that they have a big trick to deal with: one not-so-friendly ghost going out of his way to turn the Manor into a haunted house. The Charmed Ones must stop this evil soul with a vengeance before he takes the life of one experienced ghost hunter who knows his story and has met him before....