Auzou Books for my detective school investigations volume 5 chills in the forest

The apprentice detectives are heading off on a school outdoor trip! They get to enjoy camping, roasting marshmallows by the fire, scary stories… and riddles! Woken in the middle of the night, they find the instructions left by their teachers: it’s time for a "spy" treasure hunt. With eerie noises all around, it's not so easy to decipher the codes to find their way through the forest! Who will come out on top?