I thought about that to put Imogen in trouble, Addie and then Khaat added their ideas and I think we've got the perfect plot in which all of you can participate.
The plot is as follows:
Miriam is actually Beatris Greyback, but it is super super big secret closely guarded among death eaters.
But wait, it will just become complicated.
Someone discovered it, decided that it should share with the world because ... Death Eater is trying to recruit in the ministry as an innocent young girl!
Miriam found out that, of course she killed that person, but Imogen found herself at the wrong time in the wrong place, and Miriam without problems made all that seems to be like Imogen is a killer.
Now, we need the help of all of you.
We need aurors, police officers, journalists, all who are willing to help to resolve murder. Maybe even the witnesses? Some can try help Imogen and some can try to put her in jail with false statements. Although she is not a killer, it would be one less Death Eater on the loose, is not it?
Waiting for your suggestions, if you want to participate in the murder of the year, let me know