In the Series 3 finale, Leslie and Margo have news about their relationships, and as Louisa and Spiro grow closer, a circus comes to town.

Writer Henry Miller visits Larry on Corfu, and Sven is under scrutiny from the police for being gay. Leslie is forced to arrest him, causing conflict in the Durrell household.

It's Gerry’s birthday and Louisa wants to have a party and make a fuss, even though he doesn’t want to. She fails to realize that Gerry is growing up.

Spiros spends time with a glamorous Italian family who have recently arrived on the island. Louisa is jealous of the attention he is paying their new neighbors and invites the new neighbors over to learn more about them. She ends up convinced they are hiding something, while Margo feels threatened by their eldest daughter. Larry joins the fire service, and Gerry falls in love.

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.

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

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

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