After Chris Hobbs attacked him, Justin locked himself away in Brian's loft.  He's so afraid that someone will finish what Hobbs began that he's unwilling to let anyone in to see him and constantly paranoid that death is waiting for him around every corner.  While Brian is desperate to make him better, he encourages Justin to pick up a hobby.  Little do they know is that Justin's new hobby could mean life or death for both of them.