First and Only by Peter A Flannery

Psimon is a young man who has psychic abilities.  He is also able to personally feel the torture that the serial killer Lucifer inflicts on his victims.  Psimon knows that he will soon be murdered by Lucifer.  

Psimon contacts Steve Brennus, a former SAS soldier who has just lost all his money and his new business, and offers to pay him £3000 per day for the next 5 days to keep him safe.  The first thing they do is travel to America to visit the James Randi Educational Foundation so that Psimon can prove his abilities and collect the coveted $1M prize money which is on offer.  

They then need to get out of America and back to Britain before Psimon is detained as a threat to the country.  Steve Brennus has to use all his training to keep Psimon safe from both a serial killer and also the government agencies of Britain and America.