description: The aliens are invading! No, they're not from another galaxy. They're not even from Mars. They're from Hollywood! A science fiction convention has come to Bayport, and movie director Simon Devoreaux has lost his billion-dollar baby: the film of his latest blockbuster has dematerialized before his eyes.
language: English
title: The Secret of Sigma Seven
titlecomplete: The Secret of Sigma Seven (Hardy Boys, #110)
genres: Fiction, Childrens, Young Adult, Collections, Classics, Mystery
ratings_count: 151
series: The Hardy Boys
publisher: Turtleback Books