Lewis began to feel creepy. What kind of message was this? He turned the card over, and was relieved to find that the card was stamped and addressed. But the stamp looked very old-fashioned, and the postmark was so blurred that Lewis couldn't tell where the card had been mailed from. The card was addressed in a neat, curlicued hand.

There was no return address.

Lewis stood there in the moonlight with the card in his hand. Maybe Rose Rita had gotten up in the middle of the night to play him a practical joke. Maybe -- but it didn't seem likely. Lewis turned the card over and looked at the blank side again. His eyes opened wide. Now there was writing on the card.

Lewis's hand began to tremble. He had read about writing in invisible ink, but he had always heard that you had to dust the message with special powders or hold it over the fire to make the letters appear. This message had appeared all by itself.

And Lewis knew what the message said. He could read a little Latin, because he had been an altar boy once, and he knew what Venio meant: I come. Suddenly Lewis felt very afraid.