Off the Grid By C.J. Box Putnam/Penguin Random House, $27.00, 371 pages, ISBN 978-0-399-17660-9 In today’s hi-tech world, it’s  almost impossible to get away from all the must-see, must-have, must-buy  devices that  didn’t even exist  as recently  as fifteen or twenty years ago . . . gizmos we didn’t need or want until relentless, incessant, slick and highly persuasive advertising coupled with good old-fashioned peer pressure convinced us otherwise