Pre-Game LifeEdit

10 years before the events of Unwound Future, Inspector Chelmey was a diligent police constable working at Scotland Yard. His superior, Inspector Gilbert, was highly prominent in Scotland Yard, and was with Chelmey when they were informed at the accident at the Institute for Polydimensional Research. Gilbert was assassinated by a criminal in the follow-up investigation. When he lay dying, Chelmey was touched by Gilbert's sacrifice, and swore an oath to eradicate London of crime. Because of Gilbert's sacrifice, he looked after Gilbert's 17 year old son, Barton.

Professor Layton and the Last SpecterEdit

In Last Specter, Inspector Chelmey appears with Barton at Scotland Yard. Emmy finds the inspector in the police archives with the help of Inspector Grosky. Grosky, Chelmey, and Emmy search documents within the archives and find that Evan Barde's death might not have been a suicide at all. After this talk with Chelmey, Emmy and Grosky leave London to return to Professor Layton in Misthallery.

Professor Layton and the Eternal DivaEdit

In Eternal Diva, Chelmey makes a small cameo appearance along with Barton at the beginning of the movie. When Layton reveals that Don Paolo is responsible for silencing the bell of Big Ben, Chelmey gets into a police car with Barton and drives off to chase the villain as he makes his escape.

Professor Layton and the Curious VillageEdit

He is introduced to the series when he is called in to investigate the murder of Simon Reinhold, while Professor Layton and Luke are searching for Claudia. When the two meet Chelmey for the first time, he suspects them as culprits for the crime but lays off due to Layton's reasoning. Chelmey tells the two of them to stay away from the murder case; that 'detective work should be left to the detective'. While out and about, Layton and Luke discover an newspaper scrap about Chelmey containing information about him that they become curious about. Shortly after the Ferris Wheel incident in the park, Layton and Luke are called to Reinhold Manor where Layton is accused of Simon's murder, and Luke of being his accomplice. Chelmey then blurts out information that doesn't make any sense... Unless he had been stalking the two of them. Layton questions Chelmey to the point where he is forced to come clean and reveal his true identity: Don Paolo. Layton writes in his journal that the real inspector is probably at home in London, enjoying his wife's sweet potato fritters.

Professor Layton and the Diabolical BoxEdit

In Diabolical Box, the real Inspector Chelmey (along with a constable named Barton) investigates the death of Dr. Schrader and the disappearance of the Elysian Box. Towards the end of the game, he comes to the conclusion that Sammy Thunder is responsible for the crime and proceeds to arrest him, but Layton intervenes, revealing that Flora is the real criminal. Nobody believes him at first but Layton is proven to be correct when Flora comes clean and reveals herself to be Don Paolo in disguise. Don Paolo confesses to capturing the real Flora and stealing the Elysian Box, but that Dr. Schrader was already comatose by the time he arrived at his flat. Outraged, Inspector Chelmey and Barton chase Don Paolo through the streets of Folsense. What happens afterwards is unknown, although it is known that Don Paolo got away considering his presence in Unwound Future.

Professor Layton and the Unwound FutureEdit

In Professor Layton and the Unwound Future, Inspector Chelmey and Barton are present at the unveiling of Dr. Stahngun's time machine. The two of them later accompany Layton, Luke and Flora to Future London where they do some investigating. He later regroups with the other main characters, where Layton reveals that Future London is a fake city built in a cavern beneath London; that the future Luke is the mastermind behind it, since he cannot be the future Luke if they are not in the future, and that his real name is Clive. When Clive starts demolishing both cities with the Mobile Fortress, Chelmey and Barton oversee the evacuation of the citizens of the underground London. Upon Clive's defeat and the destruction of the Mobile Fortress, Chelmey is ordered by prime minister Bill Hawks to arrest Clive. Chelmey complies but subtly scolds Bill for his selfish and unremorseful attitude, stating that "criminals aren't the only blind ones". His final appearance in the game is when he tells Layton (from police records) that Claire, Layton's dead girlfriend, never had any sisters, proving Layton's suspicions about Celeste, who admits that she is in fact Claire herself.

It is hinted by him that he would investigate Bill's path to power and could possibly do something about his current position in politics.