You and we both wish to prevent pointless deaths caused by unchecked emotions.

The only thing connecting them is that they will be attending the underground auction this year.

I understand that my half-elf lineage

All the incidents have had this in common:

Your common ground is...

These girls are unrelated to each other, and checking out this book on Fridays is a fad for some reason.

The common link is that they're all girls, and all in second year, but different classes.

Are the connected in any way?

Maybe what connects the girls is not the clinic, but something further back!

No, I'm not. Looks like we've got something in common, then.

Hm, so we've something in common after all.

Well, we have something in common after all.

I never would've suspected Regis to find common ground with… a witcher.

Remember anything else? These beggars have anything in common?

Her rebellion changed the course of history - that's what we have in common. In terms of blood, we aim only to shed Radovid's.

Radovid and Emhyr differ in every respect except one

Lots of similarities between the victims. All the bodies were found in strange places, under extraordinary circumstances. Seems the murderer, whoever or whatever it is, has some meaning to convey.