Larry falls dangerously ill, and it falls to Theo and his neighbour Sven to put their rudimentary medical skills to the task of saving his life. The family's money worries continue, but Spiros brings them good news from a surprising source. Gerry adds to his growing menagerie, while Margo is emotionally wounded - but gets little sympathy from Leslie.

Margo takes great pride in her new job at the surgery, but after a chance encounter with a recluse, she begins to realise where her greatest talent lies. Louisa grows closer to Sven, but as Gerry befriends a convict and Leslie begins spending all his time in the local bars, she begins to suspect she has made a mistake bringing her children to Corfu.

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.

Louisa tries to raise some money by selling homemade food, which attracts the attention of another Englishman. However, a former lover threatens the family's idyllic existence. Gerry comes up with a plan to breed otters, Leslie accidentally shoots Roger, and Margo considers becoming a nun.

Celebrating her birthday motivates Louisa to adopt a more youthful look. Gerry has a bewildering time with Kralefsky.

Sparring for Louisa's attention, Hugh and Spiros decide to hold a cricket match between the Greeks and the Brits.

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.

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.

With storm clouds gathering, the islanders realise they can no longer ignore the rumblings of war, just as it looks as though the Durrells - particularly Louisa and Spiros - may have found their happy ending. Larry marks his return by throwing an audacious play for the locals, but there are surprises for every member of the family. Series finale.