Dead of Winter

Vintersjön, Southern Sweden, December 13th 1987, Lucia:
As fifteen-year-old Laura Aulin arrives to spend Christmas with her beloved aunt Hedda, she is also looking forward to spending time with Jack, Hedda's foster son.
But a lot has happened since the summer and Laura soon finds out that things are not what they first appear, as old faces and new seem to be keeping secrets from her. Tensions and jealousies come to an explosive finale at a party on the night of Lucia.
And when the smoke clears, all that is left is ash . . .
2017:
After her aunt's death, Laura returns to the town that she hasn't set foot in since the night of that fatal fire on Lucia Day. The one that claimed the life of her best friend, the beautiful and talented Iben Jensen. The one that Laura feels was her fault.
Haunted by that night, Laura wants nothing more than to leave Vintersjön as soon as possible, but her aunt was digging into the past and soon Laura is drawn into the quest to find out what really happened all those years ago.
But someone wants the past to stay buried . . .