Tome 1 A Court of thorns and roses by Sarah j Maas

While hunting in the snowy woods, Feyre only wanted to feed her family. But she did the irreparable thing by killing a Fae, and here she is taken by force to Prythian, kingdom of the immortals.
There, however, his prison is a magnificent palace and his jailer is not a monster. Tamlin, a Fae High Lord, treats her like a princess.
And what is this evil that is gnawing at the kingdom and risks spreading to that of mortals?
Obviously, Feyre is not a simple prisoner. But how could a young human girl of such modest origins come to the aid of such powerful lords?
His freedom, in any case, seems to be at this price.