Symbolism, Imagery, Allegory
The novel does a fair bit of obsessing over Sarah's finger. And for good reason – it's the symbol that holds together the different parts of the novel while also deepening its conversations about loss, sacrifice, life, salvation, the nature of justice in the contemporary world. That's one pretty powerful symbol.
In this section, we compare what the finger means for Sarah with what it means to the man who took it from her.