The Fourth Kingdom — Joyce Swann

On a warm September afternoon, Dr. Alexander Sinclair travels to Santa Fe to meet Dr. Karl Helmick, a brilliant but mysterious scientist. Over the next twenty-one years, the two men perfect cloning techniques that will alter the future of mankind, and Karl becomes friend, mentor, and father-figure to Alexander. The longer Alexander knows Karl, however, the more aware he becomes that his colleague is not who he appears to be. When Karl prepares to implement his plans for the future, the men discover just how far each is willing to go to live forever.