Professor Layton's daughter, Katrielle Layton, runs the Layton Detective Agency together with the talking dog Sherl and her assistant Ernest, and solves strange cases that happen everyday in London. Originally, she started the job with the purpose of finding her father, Hershel Layton, who had disappeared suddenly, but her incredible ability to solve puzzles made her well-known and she receives numerous requests.
In the wake of having located Luke and the Professor, Katrielle's investigatory instincts refuse to let her rest, compelling the team to follow the trail of the mysterious "Aldebaran" to his palatial home.
One of the famous Seven Dragons requests the team's investigative attentions after discovering a love letter written by his much-adored daughter, Allie.
Hastings employs the Agency's efforts in the search for a hand belonging to Big Ben in the hope of recovering it before the arrival of a foreign ambassador.
The Agency trio travel to the Highlands to investigate recent sightings of a strange "Nessie" creature at Loch Nem.
A new client, Hans, approaches the Agency after an encounter with an old friend whose appearance has seemingly remained unchanged after thirty-five years.
Strange goings-on in a domestic household lead the Agency's latest client to seek their advice on whether or not his wife has become a witch.
Katrielle takes on the task of reuniting a young woman with the object of her affections, a man who claimed to hail from another planet.
Bengary challenges the Agency team to solving their most ambitious case yet: a murder mystery from the realm of his own imagination.
On the tail of the fabled Relics, the Professor and Luke of eleven years prior close in on a shadowy figure, while Katrielle and co. trace their whereabouts in the present.
The paths of the two parties converge in Southampton as the final hours before the duo's disappearance count down.
Angel Arrow CEO Bergman calls on the Agency after the label's four showcase dresses vanish two nights before the world's biggest fashion show.
The Agency is visited by Mintan's fellow farmworkers, seeking the team's help after a sudden personality change in their old friend transformed him from hard-working farmer to rude gambler with an improbable perfect winning streak.
Katrielle joins a Scotland Yard blockade erected around a bridge due for demolition after a giant robot constructed by Bengary takes up residence. With the robot incapable of normal communication, Katrielle must figure out both how to get through to it and what the nature of its goal might be.
An Agencybound Katrielle receives a call from babysitter Kelly, whose concerns about her latest assignation appearing to include an invisible infant prompt the unflappable investigator to attempt to conduct a full inquiry over the phone.
Spurred by a horoscope warning that the only recourse to having "the worst day of the decade" might be to spend it with a friend, Katrielle decides to meet with Emiliana at a local café, unaware that the adroit analyst has her own plans. Emiliana challenges Katrielle to guess the professions of their fellow customers, pitting the former's highly professional profiling skill squarely against the latter's esoteric and intuitive investigation methods.
In the wake of discovering a recurring phantom figure appearing in his images, London Times photographer Pete contacts the Agency, fearing that he has fallen victim to a curse.
Tired of being treated like the Agency dogsbody, Sherl jumps at the chance to conduct his own investigation into the reported death of a beloved member of the neighbourhood pack.
The Agency trio are recruited by the head Dragon with the goal of completing a "virtual reality game".
After an incident involving an all-you-can-eat restaurant opening and Katrielle's insatiable appetite, the eager investigator accepts the offer of a cook-off challenge to settle her debt.
The youngest of the Dragons invites Katrielle and a selection of her acquaintances to compete in a game of "Ghost Escape".
The Agency trio's trip to the Marylebone Museum of Art to see the famous Mona Lisa takes a strange turn when Katrielle is informed that the museum's entire collection has been surreptitiously replaced with an array of Lisa-centric works.
Receiving an invitation addressed to her father requesting attendance of puzzle-solving event hosted by the mysterious Ariadne, Katrielle and company find themselves reunited with all seven of the renowned London millionaires at the deserted mansion of a deceased magnate.
Katrielle realises that the Seven Dragons are hiding a secret, and as she pieces everything together, the true identity of Lord Adamas is revealed.
Inspector Hastings enlists the Agency's assistance in tracking down a serial jewel thief before the criminal can enact their most daring heist yet.
The team are summoned by a young heiress whose estate is seemingly being haunted by a host of ethereal apparitions.
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