Step onto the ice. But beware the knocking from below . . .When Dahlia O’Connor receives a cryptic text from her estranged mother - her first in nearly a year - it sparks a terrifying mystery that leads her to Kallfell. Every year, her mother visited the ultra-exclusive alpine resort hidden deep within the frozen mountain shadowsHere, the global elite gather under a veneer of luxury and excess, but beneath the opulent dining halls and the lake’s unsettling, shifting ice lies a chilling secret. The wealthy aren't just vacationing; they are participating in archaic rituals to defy mortality.As Dahlia digs into Kallfell's traditions, and discovers what broke her mother’s mind, she must confront the ancient darkness waiting beneath the lake . . .