"Motorcyclist girls on vacation: or, Cave in the mountains" is an exciting adventure on the eve of summer. The book tells about the girls' exciting trip to the mountain forest, where they decide to reveal the secret of a mysterious cave. Readers will watch the incredible trials that await the heroines, as well as their friendships and loyalty to each other. The pen of the author Margaret Penrose will easily and excitingly guide you through the pages of this book, where every page is filled with adventure and knowledge.