DC Ben Jones debuted in the episode The House in the Woods as a replacement for DS Dan Scott, who "called in sick". He becomes Barnaby's new sidekick and through the end of Last Year's Model he is promoted to Detective Sergeant.
A house-hunting couple are found dead shortly after viewing a supposedly haunted cottage. Locals claim the property is cursed - but Barnaby and Jones soon hear enough to suspect several builders, developers and estate agents of resorting to murder.
Barnaby and Jones investigate when the body of a mother is pulled from the river during the local Oak Apple carnival. Closer inspection suggests the drowning was deliberate - and as the detectives find out more about the villagers, they learn the killing could be linked to the death of the victim's daughter eight years previously.
Barnaby and Jones investigate the death of aristocrat Sir Freddy Butler. Suspicions are aroused when his will disappears and his solicitor is killed in an arson attack. The prime suspects are the victim's family, but they all seem to have cast-iron alibis.
While investigating the shooting of a council clerk, Barnaby and Jones discover he was an expert blackmailer. A phone number on the dead man's blotter sends the duo to the seaside in search of his latest targets - whose boat trip could conceal a motive for the killing. Meanwhile, Joyce is convinced a local farmer knows more than he is telling.
Barnaby and Jones investigating the deaths of a female pensioner and a suspect vicar, who were both killed during Broughton village's annual contest between men and women. The pair soon discover the preacher had a secret that could provide a motive - but when another body is found, they realise the answer to all the deaths lies in history.
The residents of Elverton-cum-Latterley gather to hold a protest meeting about proposals for a supermarket in the centre of the village, but proceedings come to a halt when the battered body of a siteadvisor is found. Barnaby and Jones discover the victim had a penchant for acting out role-play scenarios with locals - but that isn't the only secret the villagers are hiding.
A choir member is murdered in the run-up to a competition and the rest of the choir members, including Joyce Barnaby, live in fear. When a bird watcher is also murdered, DCI Barnaby and DC Jones try to find the connection and prevent further deaths.
When accused murderer Annie Woodrow comes to court charged with Frances Trevelyan's death, DCI Barnaby begins to doubt the evidence for her conviction. He and DC Jones are soon reinvestigating the case, and it becomes clear they may have missed details that could implicate another person in the murder.