Earl Derr Biggers

Behind That Curtain is the third novel in the Charlie Chan series of mystery novels by Earl Derr Biggers.

Charlie Chan, visiting San Francisco to make a speech, finds himself swept into one of his most puzzling -- and dangerous -- cases! A cult known as the Golden Horde is running a spiritual retreat, helping the disturbed and the depressed find inner peace. Benny Chan, who worked for the Golden Horde, is dead ... but the …