The Number of the Beast

The Number of the Beast by Robert A. Heinlein. paperback edition. ISBN: 9780449900192.

The wickedest, most wonderful science fiction story ever created in our--or any--time. Anything can begin at a party in California and everything does in this bold masterwork by a grand master of science fiction. When four supremely sensual and unspeakably cerebral humans--two male, two female--find themselves under attack from aliens who want their awesome quantum breakthrough, they take to the skies--and zoom into the cosmos on a rocket roller-coaster ride of adventure, danger, ecstasy, and peril.