This second delightful story about Porridge Hall takes the reader back to the days when Kathy Brogan, Robin's mother, was a girl...It's December, and Robin, his friend Dan, and Sun Dance are laid low with chicken-pox. To keep them amused, Robin's mother entertains them with memories of the summer when she was eleven, and Nick and Charley came to stay. That summer, Nick, Charley and Kathy spent long days fossicking on the beach. There, they met Harriet, a strange, shabbily dressed girl who seemed full of surprises and magic. She showed the children her secret cave, discovered golden treasure, and watched in dismay with Charley and Kathy as Nick sailed away on a raft. But Harriet remains a mystery, until Sun Dance solves the riddle with a small amber cat...