E E 'Doc' Smith's Skylark Three is actually the 2nd installment in his Skylark series. Richard Seaton goes off planet hopping while his nemesis Marc Duquesne is in hot pursuit. While Richard is off experimenting with his zone of force, he discovers an alien presence intent on galactic conquest. After first forcing peace among a perpetually warring set of planets, he heads off to find an ancient race that can assist him in fashioning a credible defense.
Smith puts the pulp in pulp fiction with a space operatic rendition worthy of any 40's /50's era preteen. He leans heavy on the notion of 'forces' that our science has not yet discovered that basically do what ever he wants them to do. At the same time, he regards most of the laws of physics as mere theories that can be conveniently ignored when necessary. Oddly, he includes wives and girlfriends in the escapades and while they 'man' the consoles, they also play the quiet housewife. Meanwhile, the objective of his nemesis is murder and 'taking' his girl, when he could be enjoying untold wealth back on Earth.