Victims of the Rite

Lucifer left behind ashes and several souls oppressed by the unknown. In exchange for returning the Archangel's powers, he wants to make a deal with Skye and get the Bloody Diadem back, but where the mysterious artifact is located and... whether the game is worth the candle remains to be seen.
In the meantime... in the Middle there is devastation and despondency: Archangel Airrel fell into a restorative sleep, the bad weather outside the window is intensifying, and soon winter is coming, and along with the cold they come - the creatures of the Lower World and begin hunting!
Where do creepy monsters come from? Who is involved in the theft of the tiara and why should the Rite take place? Skye has to learn many secrets, dig up ancient skeletons and find the way to the icy heart of an immortal.