This is Ekaterin’s “Mountains of Mourning” story and, though it parallels Miles’ in many ways, it’s one that plays to her strength and awareness rather than his. It’s not about investigation, it’s about perseverance. That’s what Ekaterin does and, although she’s very good at weaponizing her persistence even in Komarr and has her chance to be Lady Vorkosigan gettin things done in Diplomatic Immunity, this is her story of actually becoming Lady Vorkosigan who is the future Countess and caretaker. It’s a fun and fast read.
Also, radioactive butter bugs.