A Court of Thorns and Roses by Sarah J. Maas

Feyre's survival rests upon her ability to hunt and kill – the forest where she lives is a cold, bleak place in the long winter months. So when she spots a deer in the forest being pursued by a wolf, she cannot resist fighting it for the flesh. But to do so, she must kill the predator and killing something so precious comes at a price ...

Dragged to a magical kingdom for the murder of a faerie, Feyre discovers that her captor, his face obscured by a jewelled mask, is hiding far more than his piercing green eyes would suggest. Feyre's presence at the court is closely guarded, and as she begins to learn why, her feelings for him turn from hostility to passion and the faerie lands become an even more dangerous place. Feyre must fight to break an ancient curse, or she will lose him forever.

https://www.goodreads.com/book/show/16096824-a-court-of-thorns-and-roses

Monstrous Devices by Damien Love

On a winter's day in a British town, twelve-year-old Alex receives a package in the mail: an old tin robot from his grandfather. "This one is special," says the enclosed note, and when strange events start occurring around him, Alex suspects this small toy is more than special; it might be deadly.

Right as things get out of hand, Alex's grandfather arrives, pulling him away from an attack--and his otherwise humdrum world of friends, bullies, and homework--and into the macabre magic of an ancient family feud. Together, the duo flees across snowy Europe, unravelling the riddle of the little robot while trying to outwit relentless assassins of the human and mechanical kind.

https://www.goodreads.com/book/show/38819914-monstrous-devices