Mathematical references in nineteenth-century novels, particularly in realist fiction, are often subtle and sporadic, making sustained analysis difficult. The Number Sense is therefore a welcome addition to full-length studies of mathematics in nineteenth-century prose fiction, complementing work on Euclidean and non-Euclidean geometry, higher-dimensional geometry, symbolic algebra, computation, and probability and statistics. Markovits savours the interpretive richness of something as small as numbers, showing that mathematics need not be conceptually complex to carry weight in fiction. The result is a compelling and intricate account of numerical thinking in nineteenth-century literature.