A thrilling expedition across Bolivia in search of the most venomous snakes in this remote country. The main goal is to discover a new species unknown to science: a large pitviper that has not been classified yet. It will be tracked down and filmed alive for the first time. Spanish herpetologists Juan Timms and Jairo Cuevas embark on a perilous expedition across remote Bolivia, determined to capture the country's most venomous snakes. Their ultimate prize? Discovering a new, unclassified species of massive pitviper, known only from a single photograph.