You get a call about meeting up with another superhero

It's then that a message flashes up on your computer. Another superhero is looking to meetup,

Message reads: Hello John! I had heard much about your escapades across the city and many criminals fear your name. I a super hero myself have always wanted to have someone to team up with. Whom I could trust to watch my back and you certainly seem more than capable. Especially with your legendary shape shifting abilities. I would very much like to meet face to face. So as to see for my own eyes if the stories are true. You can find me at the abandoned warehouse on the outskirts of the city. In Arlington street. It should be nice and quiet for us to mess around with our powers. Without any interruptions. I greatly look forward to meeting you there

Signed. M. N.

Your heart virtually leaps in your chest and a big smile blossoms across your pretty face. The letter seems tailored to stroke your ego. They know me by name! And more than that they seem to respect me. I half thought I would be the one having to initiate a meet up. But they are the ones seeking me! You ponder excitedly. Wasting no more time on reading through the letter, you stand up and head out. You know exactly the place he was referring to by memory, in fact you’d been there before. It was a while ago now, but one of the first criminals you went up against had a lair in that place.

It was a rather easy fight you seem to recall as you near the abandoned warehouse. It’s a big building with many windows overlooking the empty area outside, though all of them are blacked out. For one way clarity, allowing the people on the inside to look out. But preventing vision from onlookers. You keep walking towards the building, you were half expecting this “M. N.” fellow to meet you outside. But it appears he would prefer you go in.