A common misconception by members of the public is that secret societies are hidden from the public eye whereas in fact it is only the inner workings, rites, rituals and memberships that are kept secret.
Many of these so called secret societies started as nothing more than drinking clubs normally for men however they have evolved into something more. Most are harmless and some believe in taking care of their members first. The ones to be wary of are those that truly remove themselves from the public eye. If someone approaches you with an offer and you cannot find them on web be worried, you do not want to mess with them unless of course you believe that power will get you everything you ever wanted. Then go ahead walk into the dragon's den and good riddance to you.
The Rocket Men of Shen is a case in point, there appear to be only two references on web about them and both those are from the same source. Professor Edward Maad of Cambridge in an interview with the private investigator Wallace mentioned the society and who the members were. No other references anywhere, which brings me to the simple conclusion that before the advent of rockets this secret group was known under another name.
Shen is ancient Egyptian symbol meaning protection or eternal, based upon what Maad said in his interviews with Wallace it is obvious that the group is searching for an anti-agapic (fountain of youth). The problem with this particular search is that it will always be driven by a fanatic and the only good thing about a fanatic is that they are plagued with doubt.
Their methods to achieve their goals will always include breaking a lot of eggs to make their omelette. A group to be very scared of and be as far as away from as possible.
That being said you've got wonder what they are really up to?