Sevenby Joanna KavennaFaber & Faber, £16.99 FIZZING with wit, tricks and big ideas, Joanna Kavenna’s latest novel carries a hefty cargo. There are quests (for lost objects and spiritual enlightenment); boxes (both literal and metaphorical); and games (strategic, philosophical and metafictional). It’s also freighted with reflections on epistemology (knowledge and truth) and ontology (reality and being).