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.

(Source: Layton Wiki)