The brand new gripping thriller from the author of The Secret Chamber. Two kilometers beneath the frozen ice caps of Antarctica lies a lake, unfrozen and perfectly preserved for twenty million years. Luca Matthews has been tasked by MI6 officer Kieran Bates to lead a team of scientists to the site to discover what secrets lie trapped below. But Bates has a secret of his own, and his actions are not going unnoticed. When mining investigator 'Bear' Makuru cannot reach Luca, she starts to dig into Bates' past - uncovering a plot more sinister than she could ever have imagined. Bear needs to warn Luca - and fast. But there is an even greater threat tracking Luca across the frozen landscape: a killer who has been waiting through the long, dark months for a single chance to strike. Luca has only eight days to work out who he can trust. Antarctica is shutting down for the winter and if he doesn't get out now, he never will.