Martin fails to restart his relationship with Louisa. Her father Terry plans to smuggle explosives.
Having failed to restart his relationship with Louisa Glasson, Martin is forced out of the picture with the arrival of her dad, Terry Glasson. Terry has hatched a scheme with a colleague, Jonathan Crozier, to smuggle in some explosives which they want to use to help them in a robbery. Terry decides to back out of the smuggling, and things get even worse for Doc Martin. As he finds himself held hostage, along with Louisa, by a paranoid Jonathan, as he attempts to force Terry to carry out their plan.