summary heart of darknes

Marlow was sleepy, but they have to begin again to find the ivory,  he was thinking that Kurtz could go there also that Kurtz was sick. 


They had to stop a lot of times to repair the boat, in one of this stops, Marlow finds an abandoned shed in which  was a warning (a table with a pile of burning woods on it). 


It was late and they had to stay the rnight at the place.

(After this i dont understand anything).