Imagine our surprise when we open our door and in streaked the cat! She was gray and silver, and my first thought was actually that it was a possum, not a cat. She came running in and immediately made it quite clear that she DID NOT like other cats. Feina hid, as she's a big wimp. Ramses, on the other hand, was merely curious, and kept trying to sniff out the interloper. She was having none of that, and started hissing and growling at him, which confused the heck out of him. He didn't so much hide as make a strategic retreat.
We realized that we couldn't really keep this cat in our apartment, but we weren't really sure what to do - it was about 10:30 at night, and I wasn't really all that keen on calling Animal Control or anything like that, since she was obviously someone's pet (long-haired cat, well groomed, but no collar - grr!). We tried some of the neighbors, but they said they didn't have a cat, and she wasn't theirs. We finally convinced her to leave the apartment and get down off our stoop, but it took some convincing.
This morning, we opened the door very cautiously and there she was again! We managed to keep her from coming back in, but she didn't look like she was planning to leave anytime soon. I feel so bad about making her stay outside like that, but we really can't take her in. I'm just hoping that she finds her way home soon.