The second book following The Hunger Games picks up after Katniss Everdeen wins The Hunger Games. She now has to deal with the consequences of winning and inciting rebellions.
I was lucky to be able to read Catching Fire right after finishing The Hunger Games. Unfortunately, I am #164 waiting for the final book, Mockingjay, at the library.
I didn't think this was engrossing as The Hunger Games but it does draw you in. I don't want to say too much but I didn't expect to be pulled back in a second time. This one definitely ends in a cliffhanger, leaving you desperately wanting to read Mockingjay.