Describe the literay elements used in the book Twisted Summer by Willo Davis Roberts?

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You may get some ideas about the literary elements from the reviews in this site.

http://www.amazon.com/Twisted-Summer-Willo-Davis-Roberts/dp/0689806000

: Twisted Summer is a fictional murder mystery. The setting was at Crystal Lake, where everything took place. There was definitely irony in this book. Cici is hoping for a romantic summer but instead finds herself trying to solve a murder. The author’s suspenseful tone keeps readers turning the pages until the mystery is solved.

I need some help with foreshadowing.