Dr. Martin Ellingham is still in Portwenn—but his wife and child are not. After their tumultuous time last series, Louisa has gone for a break to visit her mother in Spain.

After Martin's first session with Dr. Rachel Timoney, we see he may have met his match. Louisa's return raises questions around their relationship: in order to stay together, perhaps they need to spend more time apart.

Martin has decided he will be the one to move out of the Surgery to allow Louisa the space she needs. Louisa is intrigued to meet Martin's therapist, but is not quite so happy when Rachel suggests that they should have therapy as a couple.

Louisa and Martin have their first therapy session together - though neither of them was expecting that they would be given homework.

Martin reaches breaking point with being followed around by Buddy: he resolves to find a vet to have him put him down. Morwenna, and eventually Louisa, manage to persuade him that it isn't quite that simple.

Martin and Louisa don't seem to be having much success with their therapy, so Dr. Timoney advises that they should try and take things back to the beginning of their relationship.

After Martin and Louisa tell Dr. Timoney about their failed date night, she questions their ultimate compatibility. She asks them if it is time they recognize that perhaps they are not meant to be together: something for them to go and think about.

In the final episode, Annie Winton desperately wants Martin to try and save her husband, Jim Winton, despite Jim having been recently diagnosed as having terminal cancer.