Twenty years ago, Abigail Sorenson's brother Robert went missing one day before her sixteenth birthday, never to be seen again. That same year, she began receiving scattered chapters in the mail from a mysterious guidebook, whose anonymous authors promised to make her life soar to heights beyond her wildest dreams. These missives have remained a constant in Abi's life - a befuddling yet oddly comforting voice through her family's grief over her brother's disappearance, a move across continents, the devastating dissolution of her marriage, and the new beginning as a single mother and cafe owner in Sydney.Now, two decades after receiving those first pages, Abi is invited to learn 'the truth' about the book. It's an opportunity too intriguing to refuse - she believes its absurdity and her brother's disappearance must be connected. What follows is an entirely unexpected journey of discovery that will change Abi's life - and enchant readers.Gravity Is the Thing is a smart, unusual, wickedly funny novel - heart-warming and life-affirming.