Helpppppp! Ten Little Indians/And Then There Were None by Agatha Christie?

Please help! i am writing a report on Ten Little Indians/And Then There Were None by Agatha Chirstie. i need to know all about the book! setting. plot. characters. ending. devices used. conflicts. you name it! i just really dont like mysteries and really dont understand this book at all and i really need help! anything will help but PLEASE MAKE SURE ALL INFO IS CORRECT!!!!!!!! thanks so much!