Layton Mystery Detective Agency: Kat's Mystery‑Solving Files

The Millionaire Ariadne's Conspiracy (Part 1) (1x47)

Air date: Mar 10, 2019

Receiving an invitation addressed to her father requesting attendance of 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.