"The secret" is to take old, uncopyrighted material, republish and sell it as your own, and make millions. This isn't what the book "The secret" will tell you, but it's how the author got rich.

I couldn’t care less (but one must keep up appearances, right?)

The Secret is defined as the law of attraction, which is the principle that "like attracts like." It is called "the most powerful law in the universe," and it is working all the time. "What we do is we attract into our lives the things we want, and that is based on what we're thinking and feeling."
The principle explains that we create our own circumstances by the choices we make in life. And the choices we make are fueled by our thoughts—which means our thoughts are the most powerful things we have here on earth.

The secret may be known for many other definitions but those are all false. the secret means your left boob. It may be very strange but very true not many people know of its name because it is secret which goes by its name. If someone were to bump your secret you wouldnt say you bumped the secret you would say my secret., as shown below.