This was a fun, fast read, but also a little underwhelming. Employing some unique, fresh ideas, with little cruft, this story held my attention as I barreled through it. But it also felt more like a novella than a novel, more like an appetizer than a main course. I wanted to know more than I was told ... or if the intent was to present a sort of meditation on grief, letting go, the value of memory and the choices we make -- then I would have liked some meatier writing, meditation, whatever, on these themes.