When her alcoholic boss Andy is sacked, lazy Hannah seeks to impress his successor Annette Walker by claiming that, like Annette's son Charlie, her brother Dan is also in a wheelchair.

Hannah's best friend Sadie returns from holiday with her handsome vet boyfriend Rich, announcing their engagement. Jealous, Hannah attends the engagement party, where her spiteful present is not rapturously received.

Hannah gives a careers talk at her old school and impresses pupil Ellie, whom she takes on for work experience. Meanwhile, Dan tags along and befriends a trio of nerds, who are being bullied by the younger brother of his own tormentor.

The siblings' mother Marion insists that Hannah look after her for two days whilst she is temporarily blind after laser eye surgery but Hannah feels enslaved. Dan becomes infatuated with Izzy, the free-spirited doctor he meets at the STI clinic.

Dan and Hannah's neighbour asks them to look after the exotic fish in his flat for a few days. What could possibly go wrong?

Hannah and Dan attend the funeral of their old drama teacher Mr Balcombe, where Hannah is thrilled to see Adam Piper, the boy who gave her her first kiss and Dan meets his equally dimwitted buddies Jack and Sheriff, who egg him on to do stupid things.