Seven teenagers travel by a trajinera over Xochimilco waters. Two of them use a witchboard and become possessed. The teenagers soon are arrive on an island, where one by one are murdered by their possessed friends.
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Marina and Francelli are two children who must confront the violence that surrounds their town, where children and families constantly disappear.
It is a society immersed in chaos and violence, a balloon addressed to the wise men gets stuck in Cirilo's corral.