From the author of the internationally bestselling The Book of Doors, another fantastical, stand-alone novel in which a trio of seemingly everyday people are members of a secret society tasked with finding and protecting hidden magical objects-ordinary items with extraordinary properties. The world of unknowable objects-magical items that most people have no idea possess powers-has been quiet for decades, but the three current members of a secret society have remained watchful, meeting every six months in the basement of a bookshop in London. They are pledged to protect their archive of magical items hidden away, safe from the outside world-and the world safe from them. But when Frank Simpson, the longest-standing member of the Society of Unknowable Objects, hears of a new artifact coming to light in Hong Kong, he sends Magda Sparks-author by day and newest member-to investigate. Within hours of arriving in Hong Kong, Magda is facing death and danger, confronted by a professional killer who seems to know ...