Hall of Infinite Doors

You decide to jimmy the file cabinet, which, for whatever reason, is very easy for you.

It's dark, so you take out your cellphone and use the screen light to read. The first file is very thick and reads "Adoption." You look back. There are other folders for "Bank Statements," "Blueprints," "Car," "Checks-Old," and so on. You check the other drawers. There isn't anything interesting, but the next to last folder--the one before is "Toxicological Results"--is missing. Right after one for "Will--Father."

You open the folder regarding: