Tom and Mia walked in the thick fog. The trees looked big and the air was cold. "Where is the way back?" Mia asked, feeling scared.

They heard steps behind them. "Did you hear that?" Tom said. The footsteps were the same as theirs. They stopped, but the noise did not stop.

Suddenly, the fog moved. They looked and saw no one. Then, a quiet voice said, "I have been walking with you." Their hearts beat fast. The fog closed around them.