Captain Gault has decided that his family must leave Lahardane. They are after all Protestants living in the big house in rural Cork, and the country is in turmoil. It is 1921. But 8-year-old Lucy can't bear to leave the seashore, the old house, the woods - so she hatches a plan. It is then that the calamity happens - an accident almost, but so vicious in its consequences that it blights the lives of the Gaults for years to come.