At a secondary school in Harry’s neighbourhood, a burned-out teacher attempts to interest his class in Wuthering Heights. But class troublemaker, smart, mouthy Fergus shows what a hopeless task the teacher has.

Harry and Fergus have become local celebrities, and the murdered man’s widow approaches asking for help. She doesn’t believe his death was a suicide, and she’s accumulated evidence––her late husband’s body cam, and newspaper clippings announcing cryptic games. But Harry isn’t interested in any more cases. Kayleigh, she tells Fergus, was a one-off. She’s his tutor, not one half of a dynamic duo.

When a body is pulled out of the river near Harry's local pub, something about the dead man feels familiar to Harry. When she remembers how she knows him, she realizes she's stumbled onto the ultimate misdirect. Harry and Fergus go undercover, with the assistance of Harry's teenage granddaughter, Lola, to find the truth. Along the way, Harry starts to grow closer to Ray, Charlie's boss and mentor.

Harry and Fergus agree to help a local loan shark known as Happy find out who murdered his employee; in return, Happy will cancel the sizeable debt owed by Fergus's father. Harry notices links between the killing and Dostoevsky's "Crime and Punishment," which brings her to the attention of fledgling serial killer Billy Lund.

A stuffy dinner party in the home of Harry's former colleague goes awry when a vomiting bug hits all the guests but Harry. After the cause of the sickness is traced to a dead body in the home's well, Charlie's sergeant, Vicky Boyle, leads the investigation. Too eager to prove herself, Vicky makes some rash choices and zeroes in on Harry as the culprit, leaving Fergus to prove her innocence.

A violent storm traps Harry, Fergus, and Lola in the local pub. Cut off from the outside world by flooded roads and downed phone lines, the trio are put in even more peril when they discover a kidnap victim in a car. After freeing the man, they realize the kidnapper must be one of the handful of strangers trapped in the pub with them.

When a wealthy matriarch is strangled to death during a video call with her horrified relatives, the woman's daughter employs the services of the Wild/Reid Detective Agency. The agency being Fergus's brainchild, Harry is as surprised as anyone to discover it exists but agrees to indulge him. Money seems to be the motive for the murder, but everyone who stands to inherit was on the call.

Zoe McCann is a recovering addict fighting each day to slay her demons. But when she is abducted only to wake up in a forest wearing a vintage ballgown, her sanity and resolve are pushed to the limit. Terrified that her unknown abductor will return, Zoe seeks out the help of Harry and Fergus. After Zoe is kidnapped again, how far will they go to save her life?

When Ray is murdered, Harry and Fergus will stop at nothing to find the killer.

Harry and Fergus look into a woman’s disappearance from a village with a history of devil worship.

When a maid of honor is poisoned at a bachelorette party, Harry and Fergus have plenty of suspects.

When an old friend is framed for murder, Orla must ask the last person she wants to for help—Harry.

The fun dies at a hotel’s murder-mystery party as participants realize a murderer lurks among them.

When the owner of Fergus’s boxing gym is murdered, he and Harry try to find the killer.

After Jamie D, lead singer of Hot Boy 4, plummets to his death, Harry's granddaughter Lola feels certain it was murder and not suicide. She convinces Harry and Fergus to investigate for the sake of Jamie's pregnant widow, the fans, and the music.

When a renowned chef's girlfriend is brutally murdered, Harry and Fergus have to contend with a rival private detective, a gangster's henchman, and an utterly baffling mystery. Meanwhile, Paula makes a life-changing announcement.

The despotic director of a cheap, daytime Irish soap opera has his throat cut in the middle of a scene; Harry and Fergus must find the culprit so filming can resume.

A fellow P.I., Harry Benedict, inveigles his way into Harry’s life by sending her a particularly perplexing case. As Harry and Fergus attempt to work out how it’s possible for a mystery writer to shoot himself in a locked panic room without a gun, they find the key to cracking the case might come from a very surprising source.

The Vibrant Villages competition is fierce, with dirty tricks and sabotage galore; so when Harry's friend Evelyn Summers finds dead fish in her pond, she assumes it's more of the same-until she finds the corpse of her estranged husband there, too.

Harry and Fergus head to the Garda station to collect Charlie, Orla, and Lola en route to Glenn and Petra’s wedding. While there, a despondent man takes the station hostage and demands that they help solve the murder of his daughter. Concerned because Harry has the ring, Glenn comes to check on them and realizes he has a die-hard situation on his hands.

Harry and Fergus take on a disturbing case-a serial killer targeting random victims and leaving a coin in their mouths. Meanwhile, Harry B. asks a reluctant Harry to travel the world with him. Fergus plans to attend college with Lola.

Harry and Fergus travel to the convent of a silent order of nuns after an old friend asks Harry to investigate a suspicious suicide, believing foul play is afoot. Elsewhere, a familiar face provides a very welcome surprise.

A fun day at the races for Harry and Fergus ends in tragedy when a racehorse throws its jockey from the saddle. Harry B discovers the horse was sabotaged and insists the owner, his father, Duncan, is responsible for the crime.

After two performers go missing from Genevieve Le Coeur's dance school, Orla and Lola persuade Harry to investigate. In search of the truth behind the disappearances, Harry and Fergus dive into the history of the school and its founder.

While attending a crime convention, Harry's look-alike is pushed to her death from a balcony. To stop the killer fleeing Harry and Fergus get security to lock the building down while they investigate. A second murder reveals a chilling connection.

When a heckler dies during a guided tour, the investigation brings Harry and Fergus into the middle of a literature-themed murder plot; in America, FBI agents fail to prevent an assassination by Diyu.