Octavo feels like the kind of book a bookseller starts matching to readers before the first stack is even gone.
Marty Neumeier has it shelved in mystery, crime & thriller, and that usually tells me the hand-sell depends on whether the book offers a hook, a pulse, and enough control to make the ending matter.
I would rather hand-sell one book with a point of view than ten blankly competent ones, and this at least sounds pointed in the right direction. Harker Publishing has it listed for 14-Oct-2025.
That alone makes it feel worth keeping on the radar for readers who follow mystery, crime & thriller with some curiosity.