Mummy knows Mary shot Sherlock, her boys could never hide anything from her even if they thought she was clueless. But Mummy was Head Girl at St Trinian's in her day; she knows a thing or two about a well executed revenge plot and has the contacts to carry it out. Nobody gets away with shooting her baby boy after stealing his boyfriend, nor is she going to let him go on a suicide mission while she still breathes. She'll turn absolutely monstrous!

In other words, Mummy fixes everything behind Sherlock and Mycroft's backs and looks fabulous while doing it. ;)

Don't care if it's tied to the St Trinian's movies or just the general idea of St Trinian's. (Honestly, feel free to never mention the last movie at all or the older one a very young Alex Kingston was in.)

Brownie points if one of her old school contacts is Judi Dench's M. (*sniff* Loved her.)