Gail, Belle, David and Hannah all encounter new and disruptive influences in their lives, kicking off interweaving stories set in a house in Manchester divided into four flats.

Gail's loyalty to Henry is tested, Andy faces a decision about his new baby, David is disturbed by a hint about Kelly’s past, and Belle’s seductive night in gets derailed.

David investigates Kelly’s past, Hannah is drawn to Andy, Gail confronts Henry with her feelings, and Belle's ex-husband comes back into the picture.

Henry grapples with the consequences of Gail’s decision, Liam throws a tense dinner party, David and Saira start a new chapter and Neil makes Belle an unexpected offer.

Gail returns with a new stance on life, David finally finds the truth, Belle’s sister comes home, and Hannah grapples with indecision at her hen party.

Hannah's wedding day arrives and all of our characters make their final choices about how to move forward with their lives.