This chapter explores what post-suicide investigations achieve. Using the three elements of oversight mechanisms to guide analysis (directors, detectors and effectors), it demonstrates that prisons have no shortage of directors and detectors, but very limited effectors, both in relation to prison suicide and in general. It is difficult to establish the merit of post-death investigations because their failures are highlighted but their successes are not. The chapter demonstrates the value of post-suicide investigations, referencing the investigations which followed the deaths of Dean Saunders and Sarah Reed. The legimitising effects of prisons oversight mean that overseers have a responsibility to speak truth to politicians which (arguably) outweighs any constraints in their remits. Prison overseers in England and Wales are more than legitimising functions that shore up state activity, but that they could achieve significantly more by targeting the government succinctly, repeatedly and robustly. It is also for the rest of us to take up the argument that the situations in which Dean Saunders and Sarah Reed died were not aberrations, but foreseeable outcomes of marooning very sick people in prison. It is to be expected that internal prison administration will fail. This book provides example after example.