Teenagers Scott and Tully find an unused study room in the library which is actually a doorway into an alternate world, where an outcast is pursuing dangerous experiments to increase his control over the emerging technology of his universe.
Used availability for Gary Blackwood's Beyond the Door
March 1991 : USA Library Binding
1991 : USA Paperback
Title: Beyond the Door
Author(s): Gary L Blackwood
ISBN: 0-02-274938-1 / 978-0-02-274938-5 (USA edition)