The author is @Mystery269
The covers:

Summary:
13 Mysteries
13 People
13 People that will stay a mystery

Personal Opinion:
I am very, very excited to read this book. This 'mystery' concept is so intriguing to me. I want this book to come out immediately! Readers, check if it is out, since I don't know when the author is going to publish it. I apologize for the delays in giving this covers, I was just so ambushed with work. But now they are here, and I promised the author I was going to do the best I could.