Author Antony M. Brown surveyed all the published theories, both evidentially and logically, in his 2018 book "Move to Murder", before concluding that, on balance, a previously-unpublished theory "is the best explanation for one of the most puzzling murder cases in British criminal history." The new theory, first posited in 2008 by Merseyside-based researcher Rod Stringer, holds that Parry was indeed the brains behind a distraction burglary, which turned to murder when his unknown accomplice was confronted by Julia after rifling the cash box – after first gaining entry to 29 Wolverton Street on the pretext he was “Qualtrough”.