Leslie falls in with a bad crowd and ends up being falsely accused of armed robbery, prompting Louisa to take desperate measures to save him. Margo takes a shine to a gardener at the Villa Mavrodaki, Captain Creech returns, and the family realises the extent of Gerry's passion for animals when he turns his bedroom into a centre for scientific learning.

The family faces the unwanted arrival of a domineering aunt, while Larry's girlfriend also pays a visit - giving the unwelcome relative an opportunity to voice her disapproval of the whole family. Sven makes an offer that helps Louisa cope with adversity and Margo falls in love - but Gerry is more concerned with his newly acquired owlets.

The family prepares for a celebration, and Margo is determined to persuade the reclusive Countess Mavrodaki to attend. Sven is put to the test by his potential family, but seems to make a good impression. Gerry begins to question whether keeping animals in his personal zoo is fair, and considers releasing them into the wild.

When the family learn that Leslie has three girlfriends, Louisa decides to help him choose which one to pick.

Louisa and Larry are both devastated to find that a dear relative has died.

Larry travels with Louisa to Aunt Hermione's Bournemouth home.

The family receives a telegram from Larry, who is in Athens for a short trip, announcing that he has a friend coming to stay – Prince Jeejeebuoy. Concerned about Gerry's education, Louisa also seeks advice from Theo.