Sun of Suns, which is a science fiction book full of sense of wonder, wit, and people in odd gravity situations getting to fly bizarre contraptions for non-gratuitous reasons, is free from June 1 to June 12 over at Audible. It’s a very good deal, if you’re a member already, and not bad at all if you’ve been thinking about joining. (Oh, and I should warn you that this book is the start of the Virga trilogy.)
Karl Schroeder is a very good writer with a lot of imagination, and I highly recommend his books. Sometimes it takes him a while to win you over; but one minute you’re just thinking, “Oh, that’s interesting,” and the next minute you’re racing through the book, your heart in your mouth.