Mystery is, not knowing the truth about some event that happened or about a person. For example, we do not know what happened to Subhash Chandra Bose. His life ended in a mystery. We do not about the life after death and what happens after. It is a mystery.

There are many mystery bestseller novel writers in all languages world over. The sense of mystery really intrigues people and they like it. People watch films and TV serials thrilled by the mysteries. If the mystery is broken, then they will lose interest. The nature was a mystery to man and woman for a long time. 

Scientists over centuries have unraveled the mysteries of the world in various fields of sciences. Mysteries are everyday lives for the police force and detectives.  For many people, their own lives are a mystery until they settle down somewhere. 
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Good Morning earthly dwellers. (Give introduction and topic) "Mystery" - Mystery Is anything that remains unknown to us or I only know to the super power.The world itself is a mystery.Even after the advancement of science with such a great pace we still aren't certain about the truth of the emergence of life on earth or the disappearance of the Jurassic creatures. Concealed thoughts and actions of one are a part of the mystery to another. What we talk to our best friend remains a mystery for the rival. However, mysteries are more than this. The Bermuda triangle remains a mystery until now. Solving the mysteries; we get trapped in situations that too cannot bt justified. To conclude I'd say, mystery remains mystery that can only be answered by the superpower. New mysteries can be discovered but solutions to the mysteries remain a mystery themselves. Thanku