A supplement to FASA's 1998 Crimson Skies, Behind the Crimson Veil adds information about the 4 successful pirate gangs - including the Black Swans - with various scenarios. It also new airplanes, like the fiery GM-1 Tempest. The supplement include the "school of engineering"; manufacturers share their construction secrets, and details on new components with special characteristics and limits. More detailed information is provided on boarding parties with zepplins, in this supplement.