A Court of Thorns and Roses by Sarah J. Maas

When nineteen-year-old Feyre kills a wolf in the woods, a terrifying creature arrives to demand retribution. Dragged to a treacherous magical land she knows about only from legends, Feyre discovers that her captor is not truly a beast, but one of the lethal, immortal faeries who once ruled her world.

At least, he’s not a beast all the time.

As she adapts to her new home, her feelings for the faerie, Tamlin, transform from icy hostility into a fiery passion that burns through every lie she’s been told about the beautiful, dangerous world of Fae. But something is not right in the faerie lands. An ancient, wicked shadow is growing, and Feyre must find a way to stop it or doom Tamlin - and his world - forever.