Fire Chief Kev Allison returns to duty at Mile End Fire Station after receiving serious injuries at a council estate due to arsonists.However, things are not back to normal..

After witnessing a suicide on the Tube , tensions emerge between Mal and Kev.It doesn't help with Mal's close friendship with Trish.Dennis hides a secret from Kev.

Little Al gets way more than he bargained for in a MMA cage fight. The next morning the team is on edge when they have to make a risky high-rise rescue