After a chaotic semester, Guinevere “Nev” Tallow is looking forward to a quiet winter break at Deephaven Academy. But when they discover a strange artifact—a scrimshaw—hidden away deep in the under-basement of the school, they can’t resist the urge to investigate further.

This scrimshaw seems to be the skull of the school’s founder, Malachi Haven. Each of the skull’s few remaining teeth is engraved with a tiny image that foretells disaster. Nev quickly becomes obsessed with this mystery—not even their best friend, Danny, can distract them.

And after something begins striking down students, Nev and Danny wonder if the images etched into the ancient teeth are actually warnings. Can Nev protect the school from the coming doom foreseen by the scrimshaw, or are they on a collision course with fate?