Skylar Mars and the Mysterious Armada

All Skylar wanted was to get back to school. He never dreamed he'd return from break to find it under siege. Forgotten knowledge and dangers rear their heads when a strange armada of derelict ships block Skylar and his friends from returning to Stars' End. No one knows where they came from, or what they really are. There are no lifeforms aboard the ships. How can they be attacking the school? What does this mean for Skylar? Will he and Stars' End survive the assault by the mysterious armada...