The Ruins is a 2006 horror novel by American author Scott Smith, set on Mexico's Yucatan Peninsula.
Trapped in the Mexican jungle, a group of friends stumble upon a creeping horror unlike anything they could ever imagine. Two young couples are on a lazy Mexican vacation–sun-drenched days, drunken nights, making friends with fellow tourists. When the brother of one of those friends disappears, they decide to venture into the jungle to look for him. What started out as a fun day-trip slowly spirals into a nightmare when they find an ancient ruins site . . . and the terrifying presence that lurks there.
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The story is also been adapted in the 2008 film The Ruins directed by Carter Smith. That goes without saying, the book is way better.
I’m fairly certain I DNF The Ruins, but I can’t remember why. Which is annoying, because at some point I’m going to have to try it again so I remember why I didn’t want to read it…