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"there was this book where this girl goes through this door in a church and like goes into a direct world where it’s just her and 3 other boys but they can’t see her and it’s like foggy then later in the story something along the lines of a cabin where a guy gets impales by a tree and later the girl gets gifted a jade necklace with a fly in it and then one of the boys later climbs a ladder of sword to prove himself, the girl is maybe named amy or zoey and i read this in 2018-2019. the girl meets the mafia where they chloroform her to bring her to the leader where they prepare for a war with the king of undead who controls flies and later the boys arrive to help "