Tamacún follows the thrilling and poignant journey of Karl Albert Ludwig von Seebach and his companion, Carl August Bolle, through the wild, untamed heart of Costa Rica in December 1864. The story begins in the bustling port city of Puerto Limón and takes readers deep into the rainforests and jungles, ultimately leading to the mysterious Tamacún volcano, also known as Rincón de la Vieja.

Karl, a seasoned explorer, and Carl, an enthusiastic ornithologist, meet once again after several years since their first encounter at an ornithological conference. They are joined by Manuel, a knowledgeable local guide, as well as a diverse team of local people.

Their expedition is fraught with peril and wonder, encountering not only the natural dangers of the jungle?jaguars, treacherous terrain, and the ever-present threat of disease?but also the supernatural. Spirits and eerie phenomena challenge their courage and sanity, particularly during their harrowing experiences near the Tamacún volcano.

The story's climax unfolds in the treacherous Cavernas de Venado, where the team battles suffocating air and dwindling torchlight.

Back in Puerto Limón, the story delves into the history and significance of this vibrant port city. The city's rich cultural tapestry, woven from indigenous peoples, Afro-Caribbean descendants, and immigrants from around the world, paints a vivid backdrop to the explorers' preparations for their Tamacún adventure.

Tamacún is a tale of adventure, discovery, and the indomitable human spirit. It captures the essence of exploration in the 19th century, blending historical accuracy with riveting fiction. Through Karl's and Carl's eyes, readers experience the raw splendor and hidden dangers of Costa Rica, a land that leaves an indelible mark on all who dare to uncover its secrets.