Killing and Other Mundane Activities

You marry men to kill them. Every woman should know that, according to Bellatrix Lestrange. It's too bad pesky private investigator Hermione Granger doesn't understand that. It's too bad she seems determined to find out why Bellatrix's husbands all drop like flies. It's too bad she's invested in tracking her down and making her pay for her crimes. Or is it? / Femslash / 1920s AU