Scholastic Paperbacks Scholastic has published multiple versions of many of the Three Investigators mysteries over the years. Two of the more prolific versions were "Terror Castle" and "Green Ghost," both of which were issued as slightly oversized paperbacks with the same artwork on the front cover, internal illustrations, and typesetting as the original hardback. Other volumes in the series are still relatively common to find, although most are standard paperback size, have new cover art, no internal illustrations, and different typesetting than the hardback counterparts. |