Nana Nkweti. Photo: Shea Sadulski/Out of Focus Photo Studio. I spoke with Nana Nkweti during the odd time after my first vaccine shot but before my second, when I felt stuck between the world as it has been since March 2020 and the world as it could be, post-immunity. This sense of being caught in two realities at once felt reminiscent of Nkweti’s debut short-story collection, Walking on Cowrie Shells. As embodied in characters like a pastor’s wife carrying a miraculous pregnancy after years of infertility in “The Devil Is a Liar,” an adopted daughter who isn’t at all