Killer Choice by Tom Hunt Berkley/Penguin Random House, $26.00, 342 pages, ISBN 978-0-399-58640-8 A harrowing ride into desperation, is how one commentator described this chilling suspense novel by a debut author who posits the following question:  How far would you go to save the life of the person you love most in the world?  That is what faces protagonist Gary Foster in this devilishly-twisted plot that puts an ordinary