The Clown Below (en Inglés) - Martin T. Collins

When Andrew Kolar decides to join some cavers he doesn't know very well on a weekend outing to a cave he mapped years before, but is afraid of, he gets more than he bargained for. Strange things start to happen from the moment these men enter the cave, bringing back uncomfortable memories for Kolar. As they go deeper into the underground the entire group grows suspicious, not realizing danger awaits around every corner in this dark mystery set inside a world of eternal darkness. A captivating adventure novel of survival by a master storyteller.