Coup de grâce

by Marguerite Yourcenar

"Set in the Baltic provinces in the aftermath of World War I, Coup de Grâce tells the story of an intimacy that grows between three young people hemmed in by civil war: Erick, a Prussian fighting with the White Russians against the Bolsheviks; Conrad, his best friend from childhood; and Sophie, whose unrequited love for Conrad becomes an unbearable burden."--Goodreads