Bittersweet version: The memory is definitely gone, but someone who loved the old protagonist tries to help them recover it
Despair version: The mindwipe was an alternative to death penalty, still often people are angry at the protagonist for no reason they'd understand
The Rook, by Daniel O'Malley. Character wakes up with no memory and a letter from her past self, who knew that she would get amnesia. Alternates between past and present character investigating.