Lather, rinse, repeat of the last two volumes: The girls get jobs, find fragments of the demon prince's magic, and take them back from the people who've been using them. The hints of a larger, overarching plot from the end of the last volume only really resurface again at the very end of this one, so that's progressing at a positively glacial pace. Though, at least now, the rival team of maids (which still seems needlessly silly) has a visual on our heroes, so maybe, maybe something of substance will happen in volume 4.
Because in all honesty, nothing the girls have done so far seems to have mattered. The prince doesn't seem any stronger or more powerful than when they started, and while they've ostensibly improved the lives of a few underworld denizens, we've only seen one of them come back into the story at any point. Splendid Work really feels like it's just spinning its wheels at this point, doing absolutely nothing to distinguish itself. If I hadn't picked up all five volumes in a sale, I would have stopped reading before now.