Meet my friend Sam, seen here rocking this venerable old Boston institution upon the occasion of the official launch event for his new book, Ghosts of Boston, Haunts of the Hub. Sam is an inspiration. Was it really only last year that he was out of work, low on hope, wondering what he’d do next? Then suddenly, an idea to parlay his interest in the paranormal into a book about one of America’s oldest cities (and therefore chock-a-block with ghosts and other spirits.) He wrote a proposal, found a publisher, wrote the book against an almost impossible deadline (two months.) Now it’s been published and has sold out twice already on Amazon. If the famous ghosts who reside in the Old South Meeting House were at home this night, they were respectfully quiet. And rightly so.