I don't want to give anything away so I won't try to summarize. Plus trying to explain the plot just makes the books sound weird. They are set in a futuristic world where the Capital City controls/opresses twelve Districts. In order to remind the Districts of their control, the Capital requires each District to send two children to an arena every year to fight to the death. Katniss, a young girl, takes her sister's place in the arena and unintentionally sets a revolution in motion. Sounds bizarre (and it is) but it is just so good!
Read: March/April 2011
Bonus: They are making the books into movies!