The series finale sees a twisted serial killer on the loose and only Terry and Gemma's coach tour knowledge can help police find the murderer. Will they solve the clues he leaves them and catch the psychopath before more bodies litter the Yorkshire Dales?

Gemma's sister, Monica is starring in an Am-Dram production of Romeo and Juliet sponsored by the town's local bakers. Unfortunately, somebody is poisoning the baker's products and lives are now at risk. In a race against time, it's one of the most Shakespearean investigations Gemma and Terry have become entangled in.

Gemma and Terry are now private investigators. Bad ones. But, as luck would have it, they have in their possession a valuable collector's piece that the murderous Bunnyman will stop at nothing to acquire. Gemma lays a trap for The Bunnyman while Terry heads up his own very low-quality investigation.

Our intrepid duo are forced to seek refuge in Shady Creek Caravan Park, a mysterious place that seems to strike a particular terror in an unusually jumpy Gemma. Here we meet an eclectic mix of characters including site owners Evie and Jed, extraordinarily clumsy chef Susan, events manager and '90s throwback Darren, drop dead gorgeous American tourist Chad, and long-term park resident Edna.

More recently arrived on the scene are holiday prize-winners (if you can call them that) Phil, who struggles to get a word in while his other half Penny struggles to stop words coming out, and excitable birdwatchers Neil and Mary, all of whom are causing quite a stir. Will any of them survive the horrors of the sinister and dilapidated Shady Creek Caravan Park?

Terry and Gemma promise to take Mildred and her care home friends, including Hilda and Colleen on an Amsterdam cruise adventure across the Tyne.

They're welcomed aboard the Empress of the Tyne by ageing lothario Captain Jack and his motley crew - Cruise Director Denise, First Officer Justin Valentine, DJ Bobby, ex-pianist Alan, barmaid Tracy and self-obsessed cabaret singer Emily. It's not long before things start to go awry in the most puzzling mystery the Tyne has ever seen.

The story follows Terry, the despondent driver of the coach who's stuck in a rut. He has no goal or passions, apart from an unrequited love interest in tour organiser, Gemma. But everything changes when an OAP dies under suspicious circumstances and Terry suspects something sinister is afoot. Soon the number of passengers has seriously dwindled and Terry feels compelled to solve the mystery and save Gemma's business; hopefully winning her love in the process.

With everyone a suspect and a potential next victim, can Terry and Gemma keep the group together, address their burgeoning attraction for each other, fend off the police, and make it to Blackpool Tower with their lives intact?