Lionsgate Movies has released the first teaser trailer for the Saw spinoff/sequel, which is now officially titled Spiral.

The trailer begins with Chris Rock's detective Detective Ezekiel "Zeke" Banks investigating a murder on a set of train tracks. However, as he responds to more and more calls, it becomes clear the perpetrator is targeting the police, and the only clue is a mysterious spiral-shaped symbol left at the scenes of the crimes.

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In addition to the teaser, Lionsgate also released the following synopsis for the film:

A sadistic mastermind unleashes a twisted form of justice in SPIRAL, the terrifying new chapter from the book of SAW. Working in the shadow of an esteemed police veteran (Samuel L. Jackson), brash Detective Ezekiel “Zeke” Banks (Chris Rock) and his rookie partner (Max Minghella) take charge of a grisly investigation into murders that are eerily reminiscent of the city’s gruesome past. Unwittingly entrapped in a deepening mystery, Zeke finds himself at the center of the killer’s morbid game.

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Directed by Darren Lynn Bousman, Spiral stars Chris Rock, Max Minghella, Marisol Nichols and Samuel L. Jackson. The film arrives in theaters May 15.