Spike and Suzy had a new job. They ran the signal tower at the top of the hill.

Messages flashed up on the screen. "We need to check each one," said Suzy. "Safe or not safe?"

The first message said, "Hi, it's Grandma. See you at lunch!"

"Safe," said Spike. "We know Grandma."

The next one said, "You won a prize! Tell us your password to get it."

Little Thunder's eyes went wide. "A prize!"

"Not safe," said Suzy. "Never share your password. That is a trick."

Another message popped up from someone they did not know. "Where do you live?"

"Not safe," said Spike. "We don't tell strangers where we live. We tell a grown-up."

Little Thunder went to get the farmer. She smiled and blocked the stranger.

"Can I make a password?" asked Little Thunder.

"Make it long and hard to guess," said Suzy. "And keep it secret."

Little Thunder whispered his to himself and grinned. "Nobody will ever guess that one."