stories exploring parallel lives (3 books)

fiction books about parallel worlds, please add to it, it's my new favourite genre apart from time travel

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1	The Midnight Library (The Midnight World, #1) by Matt Haig (Goodreads Author) 3.98 avg rating — 2,473,527 ratings score: 299, and 3 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
2	If Only by Melanie Murphy (Goodreads Author) 3.71 avg rating — 1,729 ratings score: 199, and 2 people voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
3	The Dark Tower #1-3 by Stephen King (Goodreads Author) 4.46 avg rating — 8,615 ratings score: 98, and 1 person voted	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars