You Can Say That Again — James Hadley Chase

Jerry Stevens, an out-of-work bit-part movie actor, is offered a job at a thousand dollars a day to impersonate John Merrill Ferguson, one of the richest and most powerful men in the world. Ferguson needs to finish a secret deal but hungry journalists are continually watching every move he makes. In order to complete it, Ferguson needs a 'stand-in'. For Stevens, the money is beyond his wildest dreams. But from the moment Steven's steps into Ferguson's shoes, he is thrown into a nightmare of intrigue, murder and stark terror.