de Lint has always excelled at stories wherein people meet the supernatural and end up shifting their views on the world, but Someplace to be Flying goes much further than this, adding in an entire hidden populace on Earth and drops both characters into the middle of a city wide war. The book actually takes it's time setting up the main events of the story, spending nearly a hundred pages introducing its ensemble and using another fifty for backstory before everything begins to move forward very quickly.
The story is set in Newford, includes a few characters from previous novels and short stories, but is largely populated by new characters, including a set of sisters that are like nothing I've read before (and I've been reading fantasy novels since the mid-eighties), and immerses the reader into an experience including emails, admittance forms and more.
The story works incredibly well at setting up its own mythology and plays fair with all of its charactes (although I have to admit to losing track of exactly who was who twice). A fascinating read and one that already has me looking forward to his next work.