John Lamar buys a Jade Box in Asia but it is stolen by his friend Martin Morgan. A cult, searching for the box because it contains the secret to invisibility, catches up with and abducts Lamar. After discovering the theft, the cult send a message to Martin and the pair's children: John Lamar's son, Jack, who is engaged to Martin Morgan's daughter, Helen. Jack searches for the Box while Martin attempts to discover the secret of invisibility for his own schemes.