Nazotoki wa Dinner no Ato de: Movie

Wealthy heiress and police officer Reiko Hosho boards her family’s huge luxury liner, “Princess Reiko”, and embarks on a vacation to Singapore with her trusted butler Kageyama. However, when a murder occurs on the ship, they become involved in the subsequent investigation.
~~ Adapted from the novel “Nazotoki wa Dinner no Ato de” (謎解きはディナーのあとで) by Higashikawa Tokuya (東川篤哉).