A scifi novel by Martin van Houwelingen, set in a not so distant future. With prolonged spaceflight becoming a reality through the hydrogen engine and the ample water supply found in the belts of Jupiter, the human race has expanded into the solar system. But as slowly markets for transported goods skyrocket, the ones now living on the new frontier, the largest space station orbiting Jupiter's moon Tethys, find themselves between the strict Earth rulership and a renegade invasion. Foothold of Tethys is the first in a trilogy, with Children of the Moon and Exodus of Mars being prequels leading up to Tethys.