Owen Harris: Paranormal Investigator #4, Trick Or Treat...or Death?!Paperback, 1 March 2018

After spending time with real ghosts, witches and werewolves, Owen isn't looking forward to Halloween this year. Until he meets a pretty and mysterious girl called Lily in a VERY convincing vampire costume. They go trick-or-treating together and it's sure to be a Halloween Owen will never forget.