Dom ropes in Kay to help her gather evidence about Steve, and the pair trace him to a mysterious lock-up. Tevin piles on the pressure, and Kay gives Dom an ultimatum.

Dom and Kay try to ambush Steve by breaking into his flat, but plans go awry. Kay’s loyalty is pushed to breaking point.

After being dismissed from MI5, Dom and Kay go their separate ways – but will new clues about a possible threat to the Notting Hill Carnival pull them back together?