When Mexican drug cartels and Chinese traffickers join forces to poach the rare totoaba fish in the Sea of Cortez, their deadly methods threaten virtually all marine life in the region, including the most elusive and endangered whale species on Earth, the vaquita porpoise. SEA OF SHADOWS follows a team of scientists, conservationists, journalists and undercover agents as well as the Mexican Navy as they put their lives on the line to save the last remaining vaquitas and bring an international crime syndicate to justice.