This was a rather depressing book about the fate of Juliana Quincey, an "old maid" teacher at a school for girls, whose monotonous life is enlivened by her growing affection for the first two people who treat her with respect or interest. But Sinclair is writing to an agenda, as she so often does, and so the point of the book is to show one side of the "Woman Question" -- namely, the side that claims that competition in the labour market will destroy women by denying them the life experience as wives and mothers in which their only true fulfillment lies. I'm pretty sure this was not Sinclair's own viewpoint, given her lengthy literary career and the capable, independent women she often writes.
Interesting, but not exactly recommended.