Songs of Irie

What an intense book! I had no idea about the history of Jamaica, now I'm about to deep dive on it. The only reason for giving it 4 stars is that I though the end confusing: how did Gillian knew where to find Irie when it says that Irie itself didn't know where the club was? Also it doesn't explain how Kojo died, how Gillian's family heard about her death, how they reacted, if they retaliated somehow, and why the radio station was called Irie?