Jules And Camille Are Twins, Although They Are Very Different From Each Other. It's Summer, The School Is Over, They'Re Finally On Vacation ... A Quiet Vacation? Not At All! Their Friend Guillaume Has Disappeared. Help Jules And Camille To Find Guillaume. Read The Story, Search For Messages And Solve The Games. Go! Quick! Turn The Page... The Adventure Is Just Beginning! Vocabulary: Nature, Places, Objects, Mathematics, Family, Shops, Food, Directions, Greetings Grammar: Present Indicative, Past Perfect, Imperfect, Past Historic, Near Future, Simple Future, The Imperative, Hypothesis, Questions And Interrogative Form