"The Mystery of Diamond Island" by M. C. van Doorn is an exciting and suspenseful book that tells about the adventures of a young archaeologist, Eduard Koerner, on a small island in South America. He embarks on a journey in search of an ancient treasure hidden in this mysterious place. However, haitos, betrayal and mysterious events on the island reveal unseen and dangerous secrets to the hero. The book "The Secret of Diamond Island" will not only answer questions about the treasure, but also deepen your knowledge of archeology and the spirit of adventure.