Derivatives is a large area or financial instruments, including futures, option, warrants and much more. A derivative is basically any financial instrument whose value depends on a primary instruments like a commodity, currency, index, stock etc.
I have not read this book, but it has been recommended to me by a trusted reader:
Traders, Guns and Money - Knowns and Unknowns in the Dazzling World of Derivatives by Satyajit Das. Prentice Hall
My reader was surprised to learn the tricks of the game exposed in the book.