Paul Gray is going to die for a murder he has been sentenced for. Only one person believes he is innocent - his sister. His sister enlists the aid of honorable Honolulan detective Charlie Chan, who just happens to be in London for a brief stay. Chan is convinced to help the young lady secure her brother's freedom. This is a fine, creaky mystery with Warner Oland in top form as #1 detective Charlie Chan. The cast has several names in it with a very young Ray Milland as sister's boyfriend standing out the most. Veteran Character actor E. E. Clive gives a nice hammy performance as a police inspector unable to call Charlie Chan but rather Chang. Alan Mowbray also adds his distinguished persona to the mix. The mystery has a lot of red herrings, but I figured it out based on who had no herrings aimed at him/her. See if that helps you. Quite enjoyable!