On Criminal Minds Season 10 Episode 5, the BAU is called to investigate a possible serial kidnapper, who abducts a boy each Halloween, only to release him a year later.

Each boy has been targeted by the Unsub for specific reasons, all of which appear to relate to his own sad past. His history involves a strict and abusive father who metes out brutal punishment for the least provocation.

Meanwhile, Hotch has obtained a cool Halloween costume for his son. Just as Jack is getting ready to go to a costume competition as his son's school, he is called away on the above case.

How does it all end? What provoked the Unsub to kidnap certain boys, and what exactly did he do with them?

How did Jack fare in the costume competition? Watch Criminal Minds online to find out more.