What Is Going on at Gregson Manor?

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Who (or what) is this evil force wreaking havoc on the Gregson Manor?  Jack Gregson and his two cousins set out to find this force and destroy it.  But can they?  Only if they can find the Forgotten Portal.

Read this riveting mystery by P. Wilson and see if you can follow the clues and answer the question.

Jack Gregson and the Forgotten Portal, forthcoming from Crystal Publishing.