Undetermined language
Published Nov. 14, 1971 by Penguin Books.
When seven-year-old Martha and her twelve-year-old sister Jane wish for a whole lakeful of magic, there is nothing for a poor old turtle to do but grant their wish. The girls, along with their sister, Katharine, and brother, Mark, soon find themselves in adventures with mermaids, pirates, and cannibals in this delightful sequel to Half Magic.
