I just got the email today. The options for free books are:
STAR WARS VS. STAR TREK
By Matt Forbeck
PRIDE AND PREJUDICE: THE WILD & WANTON EDITION
By Annabella Bloom and Jane Austen
HBR'S 10 MUST READS ON MANAGING PEOPLE
By Harvard Business Review
I can't say any of these appeal to me, but I choose the Star Wars one, just to flip through it.