The movie starts out with Charlie and #2 Son on an ill fated plane trip to San Francisco and the mysterious death of a writer on board. This all leads to several twists in the sub-plot and the entrance of mind reader, the mysterious Dr. Zodiac and his fake spirt world trappings. It is a very good flick and if you enjoyed Warner Oland's Chan, Sidney Toller lives up to his acting especially in this film. The Treasure Island refers to the '39 Worlds Fair exhibit and is part of the plot and includes some very interesting, period photography The ending is very dramatic and I won't spoil it but you "will" like this movie so watch for it, only on Fox Movie Network or TCM, as it is not on VHS.