"A magical serial killer is stalking the Occult town of Wrackton. Hypnotic whistling causes victims to chew their own tongues off, leading to the killer being dubbed the Whistler (original, right?). Enter the Undetectables, a detective agency run by three witches and a ghost in a cat costume (don't ask). They are hired to investigate the murders, but with their only case so far left unsolved, will they be up to the task? Mallory, the forensic science...