Concordia by Abir M Sen

Ninety days after Erevos nearly killed her, Elin Kavanagh signs the permit that sends her back to the ice.

Lake Concordia isn't like Erevos. It's warm — fed by a geothermal vent that's kept something alive and growing for a million years. And it doesn't move like the last one. It doesn't grope blindly toward heat. It checks hinges. It learns doors. It remembers.

Four hundred and twenty-nine sealed lakes lie under Antarctica, and they're not separate. They're one body of water with two hundred rooms — and the thing that touched a man's hand at Erevos has had ninety days to travel here in the dark and wait.

The Consortium didn't send Elin back for her caution. They sent her because her horror is the most convincing safety theatre money can buy — and they intend to keep drilling, one lake at a time, whether she signs or not.

A tight, one-sitting subglacial horror-thriller for readers who want their science cold, their corporations colder, and their monsters patient.