A gruta da torre

After the course, Lois travels with her family to spend another summer in Ribadeo. Quique, Greta and the rest of the gang are waiting for him, and this year there is also a new girl. He doesn't know her, but he's dying to talk to her... In the old library of Torre dos Moreno, Quique finds a book and, inside, a mysterious document that talks about a passage. Where will it be? They decide they have to find him. The investigation is shaken by the appearance of a seal, Cuquita, and also by some strange events at the Pancha Island lighthouse. Who is chasing them? Why did a man show them a gun? Quirina and Estrela also seek the answer. Meanwhile, Marquiños heard his father's voice in the sea... A fast-paced adventure, crossed by the strength of friendship, first loves and the value of books, in the 1990 Ribadeo.