Fun Edgar Wallace mystery about an inheritance of jewels hidden in a tomb that can only be unlocked with seven keys, and the various ne'er do wells out to prevent the rightful heir from getitng them.

One of the first British horror-themed movies made after the lifting of the silly 1930s ban on such degenerate things; remade as a German krimi in 1962 as Die Tür mit den sieben Schlössern.

Note: Silva is called 'Luis" by several cast members, but the note on the death certificate says 'John Silva.'