The Harvest of Samehin by José Antonio Cotrina is an action-packed fantasy trailing the adventures of twelve teenagers tricked into coming to an alternate world. Now tasked with surviving an entire year in the dangers of Rocavarancolia, the group needs to work together to make it out alive. The many magical and mysterious elements of the novel are similar to those seen in Harry Potter, so if you're into that kind of stuff, maybe give it a try.