S01E12: Mark reveals Susan's shocking secret

Dan and Susan finally admit their true feelings to one another and decide to make a new life for themselves together. Realising the complications of this new situation, Susan decides to escape with Dan for a couple of hours on one of Mark’s boats before confronting her family.

Back at Fin’s party, Mark confronts Angela, an ugly confrontation which Jimmy and Grace overhear. Devastated by their father’s infidelity, Jimmy consoles Grace and, in this moment of rare closeness between brother and sister, Grace shares the truth about Charlie and Abi. Jimmy confronts them both, and punches Charlie without waiting for an explanation.

Narinder finally admits to Charlie that she wants to be more than just friends. He realises just how special she is and they share a passionate embrace on the beach, lovers at last.

Mark is on the hunt for Susan and, following a realisation about where they are, turns up on the boat while it is out at sea, intent on attacking Daniel and taking back Susan. Susan tells Mark she is leaving him. Mark’s response is to tell Dan Susan’s awful secret. A secret which shocks Daniel to the core and ends in a final, climatic conclusion.