Douglas Hooker is a paranoid schizophrenic who steals a Bussard Ramjet ship to cross interstellar space and take revenge on someone he believes has wronged him. When a second ramjet ship gives chase, both ships begin to accelerate out of known space, fueled by an endless supply of interstellar hydrogen.
The story centers around two Bussard Ramjets and their ability to keep accelerating forever with a free supply of fuel.
The efficient Bussard Ramjet also makes an excellent weapon for Hooker, who wishes to destroy Loeffler's house.