An expedition arrives on the planet Verfebro in search of life's greatest ambition: immortality. What if the key to eternal life were only a few planetary systems away? A motley crew is sent to Verfebro in search of a mystifying elixir-one that runs through the veins of a ferocious local species: the Dracs. The members of the expedition will do anything to uncover the mysteries of life on this planet, no matter the cost.

A breathtaking manhunt in the form of an elegant space opera, based on the novel by Laurent Genefort. Thick-skins are humans genetically modified to work in space without a suit. Lark is a former thick-skinned man who became a mercenary after having his skin removed. When he receives an encrypted message from his former clan, he sets out to find them with the help of Windy, an anthropology student. But he soon learns that they are not the only ones on the clan's scent-they are being tailed by another group of mercenaries. A breathless chase ensues, forcing Lark to reconnect with his dark past.

Through the branches of the gigantic World Tree, Pierig searches for the source of the malevolence that poisons the sap. The colossal branches of the World Tree are home to many diverse clans of people, such as the Sap Hunters, each living among their tier. When Pierig is captured by the Bellicose clan for his unique skills, he learns that the World Tree is dying and its nourishing sap, the fuel for each of these communities, is being poisoned... Accompanied by three warriors, Pierig is forced to trace the origin of the evil that is eating away at the plant titan through each of its levels, and down to the very base if necessary. But along his journey, issues deeper than the root of this sickness begin to surface, putting everything Pierig knew to be true into question.