Shift

Astronaut John Bruce was the first man to pilot a space craft through higher dimensional space. Two years after his triumphant return a second John Bruce appears - as a new personality of Peter Pendennis, an imprisoned serial killer with multiple personalities. At first doctors are sceptical, then he asks to see Louise Callander, the astronaut's former girlfriend, and reveals things only the real John Bruce could know.
Astropsychologist Nick Stubbs is called in to investigate. According to the latest theories, the mind doesn't just inhabit the physical three-dimensional world. It projects into the higher dimensions and if Bruce's brain had been inadequately shielded when he'd entered higher dimensional space...
Then the killing starts. Someone using Pendennis's MO is leaving body parts scattered in places where Nick has been. With Pendennis in prison, Nick becomes the prime suspect. Soon, he and Louise are on the run but how can they escape a killer unbound by any restraints of space and time? As events escalate and the body count rises, Nick realizes the answer lies in higher dimensional space and, somehow, he has to get there.
And there's an added problem. Astronaut John Bruce just happens to be running for President.