Though the title character of David Ebershoff's debut novel is a transsexual, The Danish Girl is less explicitly concerned with transgender issues than the mysterious and ineffable nature of love and transformation in relationships.Loosely based on the life of Danish painter Einar Wegener who, in 1931, became the first man to undergo a sex-change operation, The Danish Girl borrows the bare bones of his story as a starting point for an exploration of how Wegener's decisions affected the people around him. Chief among these is his Californian wife, Greta, also a painter, who unwittingly sets her husband's feet on the path to transformation when, trying to finish a portrait, she asks Einar to stand in for her female sitter. Putting on her clothes and shoes, he is shaken:Einar could...