Layton Mystery Detective Agency: Kat's Mystery‑Solving Files
The story is set in London and follows Katrielle as she solves mysteries with her talking dog Sherl.


Receiving an invitation addressed to her father requesting attendance of a 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.