All of them are still suffering from the shocking and mysterious death of her brother Robin twelve years earlier, and it seems to Harriet that the family may never recover. So, inspired by Captain Scott, Houdini, and Robert Louis Stevenson, she sets outwith her only friend Hely to find Robin's murderer and punish him. But what starts out as a child's game soon becomes a dark and dangerous journey into the menacing underworld of a small Mississippi town.