Shaun de Waal reviewed Incorruptible for the Mail and Guardian. Read it here: Apartheid killings and awkward questions
Groenink may have finally published the book she was unable to bring out in South Africa in 2002, overwhelmed as she and the publishers were by legal threats. In that sense there is closure to her long stint of investigative work.
But Incorruptible shows that there is no closure, really, while the truth of these murders remains unacknowledged and the official accounts unquestioned. They are not closed cases, whatever the authorities say; what Groenink discovers means they are still open, still waiting for the whole truth.