How the Author Built Suspense (House of Hades)

In my book, The House of Hades, Rick Riordan does an absolutely tremendous job of building suspense. As some of you know, this book is the 4th of the series. The series is called "The Heroes of Olympus", and the previous book in the series is The Mark of Athena. That book left off on a huge cliff hanger, creating lots of suspense for the author to use. Also, in my book, its kind of telling two stories at once because the 7 original demigods got split up. This creates an opportunity for the author to end a chapter of one party on in suspense and continues the next chapter with the other party. Then the reader wants to figure out what is going to happen, and then he/she wants to read more. That is the main purpose of suspense; to make the reader want to read more. It almost makes him never want to put the book down. Suspense gives the reader feelings, like hope, fear, etc.- it can give many kinds of feeling that makes you want to keep reading.