This, the third-and final-book of the Leonaur series contains two of the six original Charlie Chan mystery novels by Earl Derr Biggers. In the first tale, we find the inscrutable Chinese-Hawaiian police detective remaking and nearly loosing an acquaintance made in an earlier case-Scotland Yard Detective Inspector Duff. The English policeman has been pursuing his quarry across the globe following hard on the trail of murder after murder. In Honolulu Duff is shot and wounded and feels he must give up the chase-but Charlie Chan is on hand to carry on-giving the case its title-and bring the guilty to justice. In Keeper of the Keys-the final novel, Chan leaves his island home to visit California, where as a house-guest of a famous opera singer he finds himself denied relaxation and embroiled in murder instead. Ex-husbands, servants and a veritable company of suspects all come under Chan's scrutiny together with a dog called Trouble, two scarves and two little boxes. A mystery indeed!