I need help with a true crime case

I'm working on a true crime book that affects me personally. Something major happened with the case, and I'm unsure of how to proceed. The situation is extremely delicate so I'm not comfortable posting the details yet, but I'm willing to talk one-on-one with someone about it. I was wondering if you all could point me in the direction of someone that has experience and would be willing to help navigate these landmines? I don't need writing help; I need help on advising things like is this the point where I drop the investigation completely, or do I consult a professional, or do I keep doing what I'm doing, stuff like that. The case is technically closed by police, but they got it wrong, so wrong to the point that I'm leaning toward something shady going on so police involvement is not an option. They are very aware of the situation and do not intend to do anything about it.