Layton Mystery Tanteisha: Katri no Nazotoki File  

Layton Mystery Detective Agency: Kat`s Mystery-Solving Files, Layton Mystery Detective Agency: Katry`s Mystery Solving Files, Layton`s Mystery Detective Agency: Kat`s Puzzle-Solving Files, دفتر کارآگاهی کشف اسرار لایتون: پرونده‌های حل معمای کتریل, 레이튼 미스터리 탐정사: 카트리의 수수께끼 풀이 파일, レイトン ミステリー探偵社~カトリーのナゾトキファイル~, 雷顿 神秘侦探社～卡托莉的解谜档案～

The Layton Detective Agency is led by Katrielle Layton, daughter of Professor Layton. She works alongside Sherl the talking dog and Ernest, solving everyday mysteries in London. Initially, Katrielle began her career with the goal of discovering what happened to her missing father, Hershel Layton. However, due to her exceptional puzzle-solving skills, she quickly gained recognition and received numerous requests for assistance.

Based on Level 5s Laytons Mystery Journey: Katrielle and the Millionaires Conspiracy game.