The Heart of Darkness- summary

I really didn't understand the plot for quite some time; okay, to be honest, I'm still not sure I really know what happened in this short story. I fell asleep like four times just in the first chapter. Basically, I felt like I was drowning in description. But then I reached page 14 (after 2 weeks, mind you) and then I was reading the part where Marlow was describing the slaves and I finally started to get into it. It's not exactly the plot I got into, but more the themes and just a few phrases I really liked. So behind the verbose, extremely eloquent paragraphs, a plot does indeed exist! The narrator of this book is unknown, but the main character is Marlow. He's basically the Clint Eastwood of the story. He begins to tale his tale of the Congo river. He describes how he became captain and travels to Africa to see the cruelty the white man brings upon the native settlers. His boat then needs repairs and he begins to learn of a man named Kurtz who many people seem to be afraid of. So Marlow and his crew are traveling through the jungle and are attacked by some natives. He then finds that Kurtz convinced a bunch of natives he was a God. Marlow stays with Kurtz for a while and he entrusts Marlow with a bunch of personal documents. Basically, there was a pamphlet that said, "Exterminate the Brutes." Kurtz is the real bad guy of the story. All I can say is the plot is much less exciting than the analysis.