A woman turns up at the Wilde's apartment to return Rupert's missing wallet, leading to Rupert to hire her as their au pair for the flat. But Amy is suspicious of her, and there are other things to tax their brains. Like what is their new neighbour up to in his flat? And why has someone planted a listening device in their home?

Amy is invited to a private party held by the elderly Mrs Tegaskis, who asks the guests if they would support a campaign for a natural lake to be built in the area. Rupert is suspicious, but Amy is more intrigued by the guest that turned up halfway through the party but wasn't seen...

The Wildes are invited by their friend Helen Bardsley to stay over at their country retreat, along with a couple of friends. But over the weekend Helen's boorish husband David becomes increasingly erratic and dangerous - only for him then to suddenly disappear...

Rupert's agent Christopher contacts the couple to investigate the new property he has bought in the country, convinced it is haunted. During the time he was there he heard strange footsteps, an odd "throbbing" noise and encountered a young girl in the study who later disappeared. Ever the sceptic, the Wildes decide to investigate further.

When a soldier moves into her recently deceased son's cottage in the country, Rachel Somerville calls on Rupert and Amy to investigate. It seems that Colonel Stone was one of a group of men with her son out in South West Africa when he died while diamond hunting, and tells the couple her son Jamie left him the property as a gift. But the Wildes are suspicious of his story and begin to wonder just how Jamie met his end...

In Manchester to meet a film producer who wants to adapt one of Rupert's novels, the couple are fascinated by a sinister looking gentleman in a diner who requests the vionlinist play "Danny Boy". The next day Rupert spots the stranger watching the arrival of pop singer Carol Fortune at the airport, and when he spots him following her about Rupert fears for her safety.

The foreign translator of Rupert's novels in Spain turns up at their house. Her daughter Maria came to England to study at a music college in Harrowgate nearly a year ago, but when she turned up at the college to visit her she is told that her daughter has never been there. But someone has been regularly collecting her mail...

Travelling on the train from Italy, the Wildes discover a woman in their cabin, only to be told that they have the wrong compartment. However, when they move to a different cabin they find their peaceful journey home is anything but!

Rupert picks up a young boy hitchhiking on the motorway. He is looking for his mother, who disappeared suddenly one day when she left with a man crying. All he has for her location is a postcard with a picture of York Minster on it...

Rupert gives a lecture at a prison, but upon returning home discovers a manuscript that has been planted in his bag. And it seems that someone is very eager to get their hands on it as later that night the Wildes apartment is ransacked...

The Wildes take a holiday to Amsterdam for 'economic reasons', but almost immediately find themselves in a mystery when Rupert discovers a mysterious woman hiding in their hotel room. She tells him she is hiding from a man following her, but runs off before he can find out more. But later Rupert is knocked out in his room. What is going on?

Rupert and Amy attend the funeral of crime novellist Will Carpenter, who apparently died of a heart attack. But something just doesn't seem right when they later attend the wake at the house - especially when they discover his wife was widowed once before. Unable to contain their unease, the couple decide to dig deeper...

Amy receives a letter from her friend Debbie Stewart, who is convinced she is going out of her mind. She keeps hearing voices in the house of her sister Annette, but she lives in America. Then she sees her in the garden and takes photos of her, but when she goes to develop the film all images of Annette have disappeared...