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A high school class attends a retreat on a mountain, but on the way home, a horrific accident occurs with both fatal and inexplicable consequences.

Upon her return, Alma struggles to recover her memories, and she's intrigued by what feels familiar. Tom bids farewell to a friend.

Diana implores Bruno to help her find her brother. Alma spends time with Tom in the hope of finding answers. A survivor discovers that he has powers.

Rumors about Carlos and pills continue to spread. Alma sorts through Deva's secret box. Bruno and company are shocked by visitors.

Tom walks Alma through his final memories with Lara and their group of friends and details their search for the supernatural Hexaspeculum.

Alma insists that she and Tom see the Hexaspeculum in person. Nearby, Martín, Bruno and Diana puzzle over the implications of the prophecy.

Alma starts piecing together what happened the day of the bus accident and remembers important moments of her life.

Martín and Diana learn more about their family's history. Berta makes a startling discovery about Roque while Deva's mom gets an unsettling visit.

Tom pays tribute to his classmates and then makes a decision about his future. Alma struggles with saying goodbye. Martín attempts to move forward.