In this atmospheric novella, the mysterious Plankton Collector visits members of a family torn apart by grief and regret. he comes in different guises. For ten year-old Mary, he is Mr Smith who takes her on a train journey to the seaside. Her mother, Rose, meets him as Stephen, by her sonÂ’ s graveside. RoseÂ’ s youngest, Bunny, encounters him as the gardener. For husband and father David, meanwhile, the meeting is with a love from his youth. And long-lost Uncle Barnaby takes the children for a weekÂ’ s holiday during which their parents begin a reconciliation. All visitors are manifestations of the Plankton Collector who teaches those he encounters the difference between the discarded weight of unhappy memories and the lightness borne by happiness recalled.