Kate is a dedicated doctor and genetic researcher working in Jakarta, Indonesia. She studies children on the autism spectrum, searching for therapeutic breakthroughs to improve their lives. Driven by a desire to help her patients and haunted by personal tragedies from her past, she becomes entangled in a dangerous global conspiracy when armed intruders kidnap two of her young subjects.

David is a highly skilled operative for Clocktower, a top-secret global counter-terrorism organization. He carries deep emotional scars from losing his fiancée in the September 11 terrorist attacks, an event that fuels his relentless drive to dismantle global terror networks. When his own agency is compromised, he must rely on his combat training, tactical expertise, and intuition to survive.

Dorian serves as the ruthless director of security for Immari International, a massive multinational corporation. He spearheads the corporation's most secretive and lethal operations, including the mysterious Toba Protocol. He operates with cold efficiency, commands a vast private army, and treats human lives as entirely disposable in the pursuit of his grand evolutionary objectives.

Howard is the director of Clocktower Central and David Vale's superior officer. He manages counter-terrorism operatives around the globe and attempts to guide his agents through an unprecedented attack on the organization's network. He presents himself as a steady, authoritative leader who maintains his composure in times of extreme crisis.

Patrick is a wounded World War I veteran and former tunnel digger whose experiences are recorded in a historical journal. While recovering from severe wartime injuries in Gibraltar, he battles an opioid dependency and falls in love with his nurse. His expertise in mining draws him into a secretive and highly lucrative excavation project beneath the bay.

Konrad is a rigid German scientist and military man who spearheads an excavation beneath the Bay of Gibraltar in 1918. He is obsessed with discovering ancient artifacts and holds dangerous, highly militaristic views regarding human evolution and survival. He represents the authoritarian ideologies forming in Europe during the early twentieth century.

Josh serves as the Chief of Intelligence Analysis for Clocktower's Jakarta Station. Accustomed to the safety of a computer screen and the quiet routine of code-breaking, he is violently thrust into a survival situation when his facility comes under siege. He is exceptionally skilled at deciphering encrypted messages and deeply dedicated to the agency's mission.

Qian is an elderly monk and leader of an isolated Tibetan monastery. As a survivor of a brutal attack on his village during his youth, he serves as the lifelong guardian of a mysterious ancient tapestry and a vital historical journal. He provides critical guidance and shelter to those fighting the Immari.

Martin is Kate Warner's adoptive father and an evolutionary biologist sitting near the top of the Immari corporate hierarchy. He holds unusual theories about the evolutionary history of humanity and the genetic significance of autism. He constantly tries to balance his ruthless corporate objectives with his personal connection to his stepdaughter.

Dr. Chang is the lead medical researcher for Immari in China. He conducts lethal experiments on human subjects in pursuit of the "Atlantis Gene" and reports directly to the highest levels of the Immari corporation. He views human life strictly through the lens of scientific data and corporate progress.

Ben is Kate Warner's dedicated lab assistant at the autism clinic in Indonesia. He helps run the study and observes the children alongside Kate, showing genuine enthusiasm for their positive research results. He is brave and protective of the children in their care.

Surya is a young boy on the autism spectrum who participates in Kate Warner's research study. He displays remarkable cognitive abilities during puzzle-solving tasks. His unique physiological traits make him a highly prized target for Immari's corporate kidnapping operation.

Adi is a young boy and test subject in Kate Warner's autism study in Indonesia. Like Surya, he demonstrates advanced cognitive skills and is abruptly abducted by masked intruders, sparking a desperate search by Kate to recover him before he is subjected to lethal testing.

Vincent is the head of field operations for Clocktower Jakarta. When the agency falls under attack, he aggressively turns against his own colleagues. Utilizing brutal methods and shadowy alliances, he hunts down David Vale and attempts to secure Kate Warner for Immari.

Helena is a compassionate nurse working in a field hospital during World War I. She provides critical care for Patrick Pierce as he recovers from severe injuries, strictly managing his opioid intake. Coming from a wealthy and influential family, she eventually becomes deeply intertwined with Patrick's life and the dark secrets of the Immari.

Mallory is an Irish associate of the Immari organization operating in Gibraltar in 1918. He acts as a recruiter and financial liaison, offering substantial sums of money to secure Patrick Pierce's expertise for a highly dangerous and secretive subterranean project.

Milo is a young Tibetan monk who assists Kate and David after they escape a brutal attack. He provides access to medical supplies and communication tools, acting as a crucial link between the fugitives and the monastery's leadership.

Robert is a foreman leading an expedition on the Antarctic ice. Operating under the assumption that he is searching for oil, he becomes increasingly suspicious as his drills strike impossible subterranean caverns and massive, secretive machinery arrives on site.

Rutger is Konrad Kane's son, who works on the excavation team beneath the Bay of Gibraltar in 1918. He holds a deep-seated resentment toward Patrick Pierce and has a prior romantic connection to Helena Barton, leading to frequent friction on the dig site.

Lord Barton is Helena's wealthy father and the controller of the Immari treasury. He leverages his fortune, his daughter's marital prospects, and his corporate influence to manipulate the excavation project in Gibraltar, prioritizing the Immari agenda over his daughter's happiness.

Jin is a resident of the Immari research facility who willingly submits to medical testing to escape desperate poverty and support his family. He represents the vulnerable populations exploited by the corporation's ruthless and unregulated scientific pursuits.

Eddi is the Indonesian police chief who responds to the violent attack on Kate Warner's lab. Motivated more by financial gain and political pressure than justice, he subjects Kate to interrogation and attempts to extort money from her while she is in his custody.

Naomi is an Immari operative and Dorian Sloane's girlfriend who intercepts Kate Warner at the research facility in China. She attempts to navigate the dangerous corporate environment to achieve her own secretive objectives, pulling rank when necessary.

Harto is a poor Indonesian fisherman who hauls a drowning David Vale onto his small boat. He sacrifices his own heavy nets to keep the vessel afloat, prioritizing saving a stranger's life over his own livelihood.