The mountain sanatorium on the edge of a glacier is a world away from the noise and hustle of Liquid City. For Rosalie, it offers a chance of health, and for Abra, Adèle's daughter and a future art student, a thrilling taste of freedom.

Things are rarely as peaceful as they seem. As Rosalie tries to piece together the past, a metal bird offers the first clue there is someone hiding in the mountains. Abra teams up with the doctor's son Jem, to follow the mystery through the snow.

As secrets come to light, and new are connections are made, their lives will take new trajectories and none of them will remain unchanged.