Over Sea, Under Stone is a contemporary fantasy novel written for children by the English author Susan Cooper, first published in London by Jonathan Cape in 1965. Cooper wrote four sequels about ten years later, making it the first volume in a series usually called The Dark Is Rising Sequence (1965 to 1977). In contrast to the rest of the series, it is more a mystery, with traditional fantasy elements mainly the subject of hints later in the narrative. Thus it may ease readers into the fantasy genre. Plot Over Sea, Under Stone features the Drew children, Simon, Jane and Barney, on holiday with their parents and Merriman Lyon, an old family friend, usually referred to by the children as their great-uncle. The Drew family meet him in the fictional fishing village of Trewissick on the southern coast of Cornwall. In the attic of the big Grey House they are renting from Merriman's friend Captain Toms the children find an old manuscript. They recognise a drawing of the local coastline that may be a kind of map, with almost illegible text, but Barney realises that the map refers to King Arthur and his knights. The children decide to keep the discovery to themselves. The family are visited at the Grey House by a very friendly Mr. Withers and his sister Polly, who invite them to go fishing on their yacht. The boys are thrilled, but Jane feels suspicious and declines to join them. While Jane is alone in the Grey House she finds a guidebook to Trewissick, written by the local vicar, in an old trunk. She realises that the map in the guidebook is similar to the secret map, but also different somehow, so she decides to visit the vicar. The man at the vicarage is not the writer of the guidebook, but he offers to help Jane. He asks some probing questions that arouse Jane's suspicions and she decides to return home. Soon the house is burgled, with attention paid only to the bookshelves and the wall hangings, and the children guess that someone else knows of and seeks the manuscript. The children decide that it is time to confide in Great-Uncle Merry. Up on the headland they show him the map, and he tells them that it is a copy of an even older map that shows the way to a hidden treasure and that the children