Since its inception in November 2013, Author's United (AU) is committed to produce books of international standards. Its first anthology "A Pinch of Love, Peace and Humanity" was a collection of short stories and poetry written by 10 internationally published authors from different parts of the world. "A Pinch of Love, Peace and Humanity" has successfully advocated the message of peace, love and humanity throughout the world. Reviewers from print, electronic and social media have appreciated the anthology and its positive impact on the readers. Author's United published second anthology "Ripples of Love" which is a collection of short stories and poetry written by 16 internationally acclaimed authors from nine different countries including Canada, India, Israel, Nigeria, Pakistan, Trinidad & Tobago, USA, Zambia and Zimbabwe. As apparent from the lineup of authors, the readers found a true blend of different styles, different cultures and different social norms in this anthology. A reader's mind will oscillate between the real-life experiences and world of imagination, as he or she is presented with 24 different stories, formulated by authors of different age groups and literary experiences. Then there comes the "Atoms of Haiku," the Five Star Haiku anthology of 19 prestigious Haijn from all around the world. 'Atoms of Haiku' started its run as amongst the Amazon's top 50 bestsellers Haiku books of all the time and still after more than nine months have gone by, it is still in the top 600 ranks. It was an achievement and certainly an outstanding reach to readers throughout the world. Author's United is proudly presenting the fourth anthology "Nothing is Mystery" in continuation of its previous efforts. This anthology will add diversity to Author's United profile. Mysteries usually are the riddles that remain unresolved. Mysteries always give you hint but never ever give you an exact answer. If a problem solver geek even solves the mystery, it will generate another mystery. Mysteries are the things that affect everyone and people gets fascinated each time. AU brings mystery at your door. Author's United has teamed up with the seasoned editors like Archana Kapoor Nagpal, Hammad Khan and Sadia Khalid to create a blend of mysteries with different styles into one book. These mysteries will fascinate you for sure. It is an honor to thank all the authors who contributed to this anthology - Biswadeep Ghosh Hazra, Debasish Mishra, Dr. Mbono Dube, Hammad Khan, Jessica M. Anderson, John Daleiden, and Sunday Igwebuike.