Jessica Ransom

Determined to come to grips with fatherhood, Doc Martin asks Louisa to move in so he can help raise their child. But it's his suggestion that she and the baby relocate with him to London that makes Louisa most uncertain. Meanwhile, when the doctor's cantankerous aunt, Ruth Ellingham, turns up at Portwenn for a funeral, she has no intentions of staying - until an unexpected gift makes her reconsider.

Portwenn is buzzing with excitement over a charity run, but the fundraiser sparks a culinary rivalry between Bert Large’s restaurant and the Crab and Lobster pub. Louisa's annoyance over her mother Eleanor's unannounced visit soon turns to relief, as she seems to have a knack for getting the baby to sleep soundly. But things take a turn when Louisa and Martin learn more about her unorthodox methods of childcare.

Unaware of her feelings for him, Martin asks Mrs. Tishell, the pharmacist, to babysit James Henry for the day. Fueled by a cocktail of self-prescribed drugs, she takes the baby and disappears. Martin, Louisa, Aunt Ruth, and PC Penhale pursue them to a castle high on a cliff.

Martin and Louisa are woken up by two fisherman after the discovery of a collapsed mystery man. Unfortunately Martin faces scrutiny after he helps the stranger. Meanwhile, Louisa has a hard time trusting James’ new sitter and finds herself sneaking around to check up on the man.

Louisa and James have an awkward final goodbye with Martin after she decides to leave the doctor. But when Martin notices something on her brain scan, he must rush to save her. Meanwhile, Bert and Jennifer’s engagement party is interrupted when tragedy strikes.