Not bad. It's your basic detective story, but set in Ghana, which is unusual (at least for this reader). It gets a bit violent a few times and I skipped a bit of that.
I think I'd prefer to know more about a few of the characters and read a bit less of the violence--not that there was lots, just that some was pretty brutal and felt fairly gratuitous.
It's got that thing from many detective story's where the flawed hero has a violent law-ignoring streak of vigilante-ism.