It’s the morning of Cat’s birthday and Sam has the perfect day planned. Tess helps new flatmate Lexy move in. Things aren’t going so well for Tess on the work front. Frankie’s career is on the up after she lands herself a job photographing a boutique hotel. Frankie’s delighted to see Cat and they share a passionate afternoon together.

Frankie is left reeling when she finally discovers the truth about her childhood. Cat makes a big choice about her future with Sam but her decision is put to the test when she discovers that Frankie is planning to leave town for good. Things start to look up for Tess when she gets an audition, only for a broken lift to throw her chance into jeopardy.

After a loved-up month on holiday in South America, Cat and Sam arrive back in Glasgow with a colossal bump. It looks like Tess finally has it all: her first proper acting role, a fabulous new flat and a gorgeous girlfriend. Frankie and Tess are struggling with the rent for their new flat and go in search of a flatmate. Frankie bumps into her former flame Sadie and offloads her troubles onto her.

Still reeling, the friends each try to deal with events in their own way. When Sam starts asking questions, Frankie makes a drastic decision. Sadie and Lexy both have surprising guests. Tess enlists Ed's help with the difficult Nora, but is unprepared for the consequences.

Tess's 30th birthday is approaching and she's desperate to ignore it, but her friends have other ideas. As Ed organises her surprise party his desire to tell her his true feelings reaches fever pitch, but could their friendship survive if Tess knew the truth? A work assignment brings Frankie and Cat closer together as they take a walk down memory lane, but as their feelings grow deeper a shocking revelation drives Cat back into Sam's arms.

Emotions run high for Frankie at her beloved aunt Carol's funeral, and things get worse when her uncle Cameron treats her like an outsider. Meanwhile, an encounter with a teenage thief gives Cat a second chance to woo Sam at the police station, and Tess tries to coax Lou out of the closet by inviting her to dinner.

Spirited photographer Frankie returns home from America for the funeral of a beloved aunt, but her reappearance throws the lives of her friends and former lovers into disarray.

Frankie visits the registrar's office to solve the mysteries of her past, but she gets more than she bargained for when she takes a closer look at her parents' death certificates. Cat does her best to make sure she and Sam continue to enjoy their relationship's honeymoon period, a flirtatious encounter at work ends in disaster for Jay, and Tess gets a shock when she decides to pay Lou a surprise visit.