Thirteen-year-old Ava Bonney possesses an unusual intellect far beyond her years. While her friends play, Ava's fascination lies in the intricate process of animal decomposition, studying roadkill found in the streets around her home.

But, one night, Ava's secret nocturnal routine takes a chilling turn when she stumbles upon the lifeless body of fellow schoolmate, Mickey Grant.

As Detective Seth Delahaye takes charge of the perplexing case, Ava refuses to sit idle. Determined and resourceful, she embarks on a daring quest to unveil the truth behind the string of chilling deaths plaguing her community.

Armed with her unique skills and unrivalled local knowledge, Ava becomes an unlikely force in the race to apprehend the elusive killer before more lives are claimed.