A House at the Bottom of a Lake by Josh Malerman
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I usually don't go for short stories, especially at this price point, but the cover design was striking and I really enjoyed Malerman's last novel.
'A House at the Bottom of a Lake' doesn't disappoint. It's a story about first love and fear of its loss and of the wider, stranger world yawning in front of you at 17. I feel this easily could have been developed into a novel.