What does the term Mystery refer to?
A mystery is something that baffles understanding and cannot be explained. Mysteries are also stories where a problem, crime or puzzle must be solved.
Mysteries often contain secrets or hidden qualities that must be solved. There may be information that is unknown and must be explained. Professional detectives and sleuths seek out clues to solve mysteries. To solve a mystery, people must use their skills and reasoning.
Mysteries have become a popular genre of fiction among people of all ages and people enjoy reading mystery books.
Types of Mystery Books -
Mystery books can be divided in to 2 categories
i. Fictional Mystery Books
ii. Non-fictional Mystery Books
Non - Fictional mystery books usually contains a story where a detective (may be a professional or amateur) investigates and solves a crime, where as Mystery fiction concentrates more on the logical aspect and the solution that exists in the mystifying element.
Popular Mystery Authors -
Mystery books are entertaining and keep the reader engrossed. Many like to read mystery book series where the story revolves around some interesting characters. There are several best selling mystery authors such as Agatha Christie, Barbara Cartland, Harold Robbins, Georges Simenon, Sidney Sheldon, and more.

List of popular websites selling mystery books:
www.stopyourekillingme.com
www.mysterynet.com
www.amazon.com
www.mysteryguild.com
www.mysterybooks.ca
www.goodreads.com
www.mysterybooksonline.com
www.killerbooks.com
www.murderbythebook.com
www.mysterybookstore.com
www.mysterybooksc.com
Out of all the above listed sites I liked the website Mysterybooksc.com the most. I personally enjoy reading mystery books written by popular mystery authors like Agatha Christie, Barbara and Sidney Sheldon. Hard to believe but I found all my favourite mystery books at one place, that too at reasonable prices.
I would recommend all mystery book lovers to visit the site.

Thanks,
Pranamita