I don't know if anyone has seen this bit of clever marketing, but it's intriguing anyway.
The pen name is that of a pair of writers and is going to be revealed at the opening night of Bloody Scotland (Friday 12 September 2025).
The writers are supposedly well known, have both been published for a decade, and one is more successful than the other. The book is comic/satirical crime (see Amazon blurb): The Ending Writes Itself: The buzzy locked room mystery crime thriller everyone is talking about for 2026 eBook : Clarke, Evelyn: Amazon.co.uk: Kindle Store
Deliberately unisex name makes me think one male, one female, but this may not necessarily be the case. It looks like at least one must be Scottish. Maybe one writes crime/thrillers and the other comedy?
Any ideas?