Extinction Horizon meets Contagion in this sequel to 2025's sci-fi thriller Symbiote, where the biological threat has escaped the South Pole and is now wreaking havoc upon Antarctica.

The survivors of the South Pole massacre will find that getting off the Antarctic continent may cost them their lives....

Months after the events of Symbiote, sunrise has come to the ice continent, bringing with it the beginning of the annual tourist season. where 1,500 summer visitors will soon call the coastal McMurdo Station home. With them are the architects of the classified CIA program that unleashed the deadly microbes, who are determined to uncover what happened with their experiment and harvest samples of the mutation to turn into a biological weapon.

However, when Ben Jacobs returns from an impossible journey to the Pole and is reunited with Penny—an asymptomatic carrier of the symbiotic microbes—all hell breaks loose. When the sea ice surrounding the station becomes a fertile breeding ground for a new and more dangerous infestation, Rajan Chariya and his friends will have to join forces with the CIA to fight the onslaught of infected "sea people" roving the streets. With tensions high and stakes even higher, the question becomes when will the group stop being useful, and start becoming targets who know too much?

Worse, there may be more than one asymptomatic carrier....

With a heart-stopping pace and twists that will leave listeners breathless, Sentient is a thrilling sequel that brilliantly combines all the best horror tropes with real world scenarios.