Freely download the book, Relentless, authored by Tim S Grover from our web page. The pdf of the book can also be downloaded for free. The concept of the book contains such values as strong work ethic, the desire to survive, and the ability to.perform at the highest level when necessary. Because of Grover’s direct and straightforward manner, readers are encouraged to forge on when people around them are quitters making it a guidebook to success and breaching barriers.