John Marquez

A new police officer, who has narcolepsy, replaces Mark Mylow; Martin treats a girl who's been taking her mother's diet pills.

Louisa's new neighbors cause problems for her, for Martin and for other residents; townspeople notice something unusual about Joe Penhale.

Unhappy with his lot in life, Bert Large abandons his plumbing business to start his own restaurant, but the eatery's opening is followed immediately by several cases of food poisoning.

Louisa's stress is compounded when she must take a group of students on a sailing trip. Ruth's decision regarding the farm causes trouble for the Large family enterprises, and so Morwenna and Al throw an event to launch Al's new business.

There's something wrong with PC Penhale's older brother, Sam. Elsewhere, Bert Large gives romantic advice to his son, Al, which only makes things worse with Pauline. And at a dinner to discuss her medical research, Edith kisses Martin.

Morwenna's parents pay her a surprise visit and are taken aback by her relationship. As Louisa starts her new course, Penhale investigates a break-in at the school.