
Philip MacDonald first came to my attention for having written a handful of impossible crime novels but this is not one of them, and nor does it feature his series sleuth Anthony Gethryn. I stumbled across my copy of X v. Rex in a second-hand bookshop a good while ago and, as he was out of print at the time (one Gethryn novel, The Rasp, has since been republished by Collins) I picked it up for future perusal. And so, with the Crimes of the Century at Past Offences dipping into 1933, here we are – with policemen in and around London being targeted by a killer, and a government sliding into disarray as the previously unimpeachable bastion of order is attacked seemingly at will.