The ABC's of Love. When Alex wants to spend time with her ex, Seth says "X" must make room for "I" and "U." But there's something Seth doesn't know. Julie has a makeover idea for the Newport Group.
The Doctor is alone, powerless and terrified, on the leisure planet Midnight. Soon, the knocking on the wall begins. As paranoia turns into a witch-hunt, the Doctor's greatest strengths are turned against him, and a sacrifice must be made…
DC Havers is reinstated to DS, following the discovery of the apparent suicide of Morag MacNichol - which turns out to be murder.
After their tumultuous time last series, Louisa has gone for a break to visit her mother in Spain: to have some time to think and get some perspective on her marriage. Martin has promised to see a therapist but as usual, life in Portwenn transpires to get in his way in the shape of a Lifeboat training exercise. Will Martin be marooned at sea, and will he miss his first therapy session with Dr Timoney?
DCI Lewis investigates when a well-respected mullah is killed in an arson attack on his home.