The Galaxy Primes by E. E. 'Doc' Smith, Science Fiction, Classics, Adventure, Space Opera

The ship was called the Pleiades, and it was Earth's first starship. It could travel instantaneously to literally anywhere in the universe - but that was just the trouble with it. For there was absolutely no way of predicting where in the infinites of space it would reappear when it winked out of the Solar System, and no way of knowing how to return. Its crew was two men and two women, each a Psionic Prime with mind-powers unparalleled in Earth's history. The tale of how they pitted their powers against an entire universe is one of daring adventure on the galactic scale...