The Importance of Being Ernest is the 26th episode of Layton Mystery Detective Agency: Kat's Mystery-Solving Files. This episode is an adaptation of Case 10 from the game Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy.
When Ernest and Katrielle met for the first time, Ernest was suspected of stealing important papers from Donald Albain, a professor in plant genetics, at Gressenheller University. Katrielle joins the case to help Ernest prove his innocence.
- Starting with this episode, new opening and ending credits appear in the series.
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