While it sometimes seems like people are taking the “shared universe” concept a bit far — we’re looking at you, producers of the connected G.I. Joe, Micronauts, and M.A.S.K. movies — there are some who still understand how to do it right. Take writer Seanan McGuire, whose Wayward Children series started with the main book Every Heart A Doorway, and now continues with the stand-alone prequel novel Down Among The Sticks And Bones (hardcover, digital). But in talking to McGuire about how the new novella came together, she revealed the clever way it connects, but also lets you disconnect it, from the main books in her series.