"The truth is always stranger than fiction!"
— Katrielle Layton

Katrielle "Kat" Layton is the protagonist of the Professor Layton game Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy. She is the daughter of Professor Hershel Layton.

Katrielle is described as being a "riddle-solving detective", who takes on various cases in London. She is assisted by Ernest Greeves and a talking dog named Sherl.

Personality Edit

Katrielle is described as being a funny person, who has an active imagination in solving puzzles and cases. She relies largely on her "miraculous instinct" to solve mysteries and jokingly mocks investigators that rely solely on concrete evidence. This causes some like Sherl to credit Kat's success to dumb luck. She'll often give imaginative or complex explanations for mysteries. This all leads some, such as Emiliana Perfetti, to not take her seriously as a detective.

Kat also has a healthy appetite, being able to put away a large dinner and still have room for dessert, not unlike Luke Triton.

History Edit


Pre-game (Case 10) Edit

Prior to the main events of the Millionaires' Conspiracy, Katrielle had stopped by Scotland Yard one day, presumably to get an update on the investigation of her father's disappearance. There, she met Inspector Ercule Hastings, who, at the time, was interrogating Ernest under suspicion of stealing research papers belonging to Gressenheller University professor Dr. Gene Ohm. Disgusted by Hastings's jumping to conclusions and lack of evidence, Kat convinced him to release Ernest and resume the investigation.

Gressenheller being her next stop anyway, Katrielle joined Ernest in returning to the university, offering to prove his innocence -or guilt- "en passant." Once there, her instincts lead her to retrace Ernest's steps that day to the letter, including stopping to smell roses. This lead to the truth of the case, clearing her friend's name.

Case 01 Edit

In appreciation and affection for Katrielle, Ernest joined her as an unpaid assistant when she opened the Layton Detective Agency soon afterwards. The agency's slogan, "Any mystery solved," lead an amnesiac Sherl to test Kat's mettle with a puzzle before enlisting her services in uncovering his past. Kat, however, put this on hold in favor for a "more interesting" case- the apparent theft of the hour hand of one face of Big Ben, brought to her attention by Inspector Hastings. Kat, Ernest and Sherl now working as a team lead their investigation from Big Ben itself to Chancer Lane, the street the Layton Detective Agency can be found on, as well as home to a popular restaurant worked at by Waiter and Lipski's Patisserie - ran by Aleks Lipski, brother of clock technician working in Big Ben, Hans Lipski. The team discover many of the items of furniture and decoration in Lipski's patisserie are made,of wafer, and eventually even find the plans for a wafer clock hand in the waste paper bin in front of the pastry showcase. From her findings in Big Ben and the patisserie, Kat eventually deduces that the missing clock hand was not in fact stolen, but was instead melted by the rain - as it was made of wafer! Hans had broken one of the original clock hands whilst working in the tower and so Aleks, his brother, constructed a decoy hand out of wafer so no one would find out about Hans' mistake.

Case 02 Edit

Case 03 Edit

Case 04 Edit

Case 05 Edit

Case 06 Edit

Case 07 Edit

Case 08 Edit

Case 09 Edit

Case 11 Edit

Case 12 Edit

Trivia Edit

  • She is 21 years old.
  • Katrielle is a name that means "God is my Crown". It is Hebrew in origin, much like that of her father. It is regularly spelled Katriel, or Catriel.