The fourth installment of the Colour Coded series sees the team grappling with the fallout from the Roslin bomb, compounded by the shocking revelations about The Red Rocket's past. As Rocket hides behind their strict 'No Pasts Allowed' policy and deflects any questions, the team becomes divided over whether the rule should remain. However, personal conflicts must be set aside as they focus on monitoring Neon's new site in Falkirk and uncovering the true intentions of their allies, The Umbras. When Rocket is abducted by a ghost from his past, the team finds themselves hitting dead ends in their efforts to locate him. Will Colour Coded rescue their comrade in time? Will The Umbras honour their word? Or will Neon's rogue agents succeed where he failed, reducing Colour Coded's headcount from ten to nine?