Explaining Authors Writing Craft/Style

     I am reading "And Then There Were None" by Agatha Christie and i am about 100 pages in. Everyone in the mansion was suspicious from the start but their suspicion has grown immensely throughout the book. People are just randomly dying as time goes on, and as each person dies, more things are discovered and they draw closer to what is going on. 
     So far, two people have died under extremely quirky circumstances. There were ten clay dolls in the middle of the dining room table, and there were ten people there to start. As each person dies, a clay doll goes missing from the table. Some questions that not only i am asking, but the characters in the book are asking too are: What will happen next? Who will die next? Who is the mysterious host of the mansion? Why are the dolls going missing? Why cant the leave the island? 
     I think that when you are righting a novel like "And Then There Were None", it is very smart to make the reader question things, just like I am right now, because if you are left with questions like this, you are going to keep reading on until you find some answers. Making the reader ask questions is a good way of intriguing them, and enhancing the mystery in the story. I will definitely be using this technique in the next novel i write.