Dorien is treating herself, Sharon and Tracey to a Christmas holiday in the Canaries but even before the plane has taken off annoying passenger Morgan's predictions of disaster have caused nervous flier Tracey to hit the bottle whilst Dorien makes a play for a handsome but unresponsive man who locks her in the toilet to get rid of her. When Sharon's bath salts start to leak Morgan declares that there is a bomb on board and the flight is postponed. The trio return home where Garth, deserted by Marcie, and Travis are hoping to hold a party and end up with a celebration ...
Whilst conducting market research Dorien gives the family an IQ test and Sharon amazes the others with her extremely high IQ. Travis uses her in a school experiment, much to her annoyance, whilst Dorien also exploits her by persuading her to go for a job with MI5, as Dorien wants information for a spy novel she is planning. Tracey, however, is more concerned about Garth, who feels useless and unhappy now that Marcie has returned to Australia.
Amongst fan mail from readers of her book Dorien finds a letter from Naomi, the daughter she gave up for adoption fifty years ago after she fell pregnant as an unmarried teenager. Dorien is not keen to see her so Tracey writes her a letter posing as Dorien though the result surprises everybody. Meanwhile Tracey teaches Travis a lesson for taking her for granted.
Tracey gets a letter from her auntie Vera, who is retiring as Pearly Queen and wants her to take over but Tracey faces competition from a jealous Sharon, who believes she should have the title and they go head to head to see which can raise the most money for charity. Meanwhile Dorien gets to finally meet her daughter Naomi and after a shaky start finds that they have more in common than Dorien had imagined. Unfortunately Naomi has just been offered a parish in New Zealand.
Whilst Dorien is holding her book group at the house the police turn up to search it as Travis is arrested for selling counterfeit cigarettes. When Travis admits that he was covering for Garth, who has previous convictions. Tracey must decide which of the boys must take the rap.