The Invincible Fifth
E E Cowper, P B Hickling
language
(Books to Treasure, July 8, 2018)
In the fourth and final adventure, Crystal, Nicolette and Kitty find themselves at a loose end for the Christmas holidays until Barbara invites them to join her at Reculvers, her home beside the sea. They are quickly embroiled in a mystery which only adds to the excitement of the festive season.