Doors

[There's nothing truly memorable about the teenage girl that had breakfast with her brother at Jimmy's. Nothing save for the wide-eyed look she gave every single person that came into her line of vision. Nothing save for the fact that she borrowed her brother's pen to scratch out all the existing prices on the menu and change them, based on cost of ingredients, to increase profit margin. But, after the pair leave, there's a note left behind on a napkin.]

[Note left for Helena]

The boy behind the counter called you Helena.
Helena of Constantinople was the mother of Roman Emperor Constantine.
The pancakes should be cooked 2.3 seconds longer.
My name is River.
Based on the names of the people you've spoken to, I'm assuming you're from a Door.
The probability of Damian + Helena + Stephanie + Dick + Bruce being mentioned in the same conversation without it being related to a comic is negligible.
(I've read 15 comics, 5 books and 2 screenplays while I've been here. It's research.)
Hello.

Would anyone out there be willing to sell a key to their Door?

[Following this, the Riddler signal lighting up Gotham's sky is destroyed in an explosion. Aside from some additional structural damage, there are no casualties, but outside the building in question are a group of unconscious Blackgate prisoners, all trussed up and waiting for police.]

[Stark Tower makes the news early Thursday morning when 911 is called to the building, which has been relatively quiet since the death of Tony Stark two months earlier. Unconfirmed reports state that two teenage students from Midtown High School were removed from the premises by paramedics. Witnesses report that police spent hours removing illegal substances from the premises. One of the girls, an unidentified redhead, is said to be in critical condition at a nearby hospital, a victim of an overdose that might leave her with irreparable brain damage. The other teenager has been medically cleared and transported to NYPD holding, where she is expected to be charged.]

[Locked to Luke H]
[After this.] Come get Corvus, now.