A man’s body is found on a canal towpath. In his pocket, a plastic magnet in the shape of an E. Days later, a second victim is found, this time with the letter V tucked into her clothing.
As the body count rises, the eerie, childlike clues point to a pattern that sends DS Allie Shenton and her colleagues into full alert.
The race is on. Allie and the team must work quickly to determine where the killer will strike next. The rules are simple but deadly – to catch the killer, they must follow the leader.