For evidence of the restless enthusiasm Freeman Wills Crofts brought to the writing of detective fiction, look no further than the two books he published in 1934. The first — The 12.30 from Croydon, a.k.a. Wilful and Premeditated — was his first inverted mystery, a fairly standard affair in which we are wise to the killer’s reasons, actions, and thoughts from the beginning and which Inspector Joseph French then unpicks quickly in the closing chapters. No doubt Crofts was interested in this new form, but simply repeating a formula which, if we’re honest, gets a little bit long-winded in the closing stages did not appeal. And so changes were wrought for a second stab.
The Invisible Event 