Having worked as missionaries in Kenya, Morwenna's parents, Jack and Tara Newcross, pay her a surprise visit, and are surprised by the relationship between her and Al. Morwenna is shocked to discover the real reason for her parents' return is that Tara has cancer. She has decided against treatment because of her faith. Both Morwenna and Martin think this is a foolish decision.

Louisa's first Skype call for her new course doesn't go as planned when Martin decides to tell the lecturer his thoughts on the coursework.

There has also been a break-in at the school. The thief doesn't appear to have stolen anything - but has torn up photographs. Initially Louisa suspects it is vandalism, but Penhale isn't so sure. When it happens again, this time at the Lifeboat Station, Penhale is able to piece together, with the help of Louisa, that Dan Willis, a former pupil, is the face being torn out of the photographs.

With the help of Dan's mum, Andrea, Penhale decides to set a trap to catch him by placing a photograph in the local shop window. Martin asks Ruth for advice when it becomes apparent that Dan has stopped taking his antipsychotic medication and could be having a breakdown.

Morwenna convinces Jack to give Martin Tara's doctor's information, when Martin suspects she has been wrongly diagnosed. His suspicions are proved correct when he diagnoses her with Hydatid Disease. Both Tara and Jack believe it is a miracle.

Caitlin seems to be after more than just a hand from Bert at the shop, so he decides to ask Al if he can stay at the pub but Al won't relent. Unwanted lodgers are also a problem for Martin and Louisa: Martin thinks that Buddy's days as a family pet are numbered, especially when he appears to have made a friend, Bob, who wants to move in too.