Despite growing tired of the struggles of modern dating, Sammy meets mild-mannered Tom and proposes an unconventional relationship with a time constraint of three weeks before they go their separate ways.
The unexpected revelation of Tom being a father proves to be too big of an obstacle for Sammy, who has never wanted kids, so the pair try to explore other options for their relationship.
Still recovering from the discovery of his ex, Sammy agrees to meet Tom's friends, but an emergency on a wild night out leaves Tom trying to balance his relationship and his parental responsibilities.
Sammy has a harsh introduction to parenting as she babysits Ellie for the first time, while Tom realises he has drifted from his mates and tries to forge a new friendship with another dad at school.
As nerves fray on the opening night of Gillian's restaurant, Sammy grows anxious about her role in Tom and Ellie's life, Raina still does not know about the relationship, and Olivia begins to act out.
Sammy and Tom's relationship hangs in the balance as the two spend Christmas time apart from each other, but they are soon encouraged to try again and share their true feelings.
