If you asked me what comes to mind when someone says “essential locked room mysteries” I’d rattle off an answer that I suspect would be familiar to many others – Rim of the Pit by Hake Talbot, Nine Times Nine by Anthony Boucher, Death From a Top Hat by Clayton Rawson, Invisible Green by John Sladek, and a whole batch of John Dickson Carr novels. The Carr novels would be of my own opinion; the rest are more of a recitation of canonical titles, most stuck in my mind by this list compiled by John Pugmire.
I’m not going to debate the viability of that list here. Nor should I. I’ve possessed enough fortitude to abstain from burning through the contents, withholding the enjoyment of the titles for future days. Instead, I’ll call attention to Invisible Green by John Sladek. The novel sounds like an impossible crime enthusiasts fantasies come to life – members of a detective book club are picked off one by one under impossible circumstances. Imagine my surprise when I learned that another book by Sladek – Black Aura – is held in higher regard by many. Both books are somewhat tricky to find on the cheap, so when I stumbled upon Black Aura for a steal, I was quick to snatch it up.