Lionel Twain invites the world's five greatest detectives to a 'dinner and murder'. Included are a blind butler, a deaf-mute maid, screams, spinning rooms, secret passages, false identities and more plot turns and twists than are decently allowed.

Paul Manderley, eccentric historian, and his wife, descendant of the Borgias, live in an isolated castle-like mansion in the Mojave Desert. When a guest suddenly collapses, Charlie Chan is invited to stay. As the standard mystery-mansion props come into play, and all means of outside communication are sabotaged, it becomes evident that...

Chan goes to Paris for a reunion with friends from World War I. There he investigates the murder of a munitions manufacturer who was supplying arms to the enemy. At the end Charlie preaches to us about the dangers of peace conferences.

After receiving congratulations from the Home Secretary for solving his most recent case, Charlie is sought out by Pamela Gray, a beautiful but desperate young socialite whose brother Paul awaits execution for the murder of a weapons inventor. She is so convinced of his innocence that she becomes distraught when she overhears Neil Howa...

While Charlie is distracted with the birth of his first grandchild, son Jimmy impersonates his father in order to investigate a murder aboard a freighter in the harbor.