I'm coming very late to this one, so I'm lagging badly. However I have a complete grid ... and that's it. (I have the message.) I can't locate any 8-letter prison anywhere. The two obvious ones (the pelican one and the 14/7 one) aren't there. The hints already offered (real, but semi-fictional) leave me as confused as I was before. Now that all you clever types have finished, would someone give a gentle hint (aka a massive shove)?