Ella lay in wait for the light every night for a week, with no luck. And she was just about to give up - could she have been imagining it? - when it suddenly re-appeared. Ella's heart thumped in excitement, and she waddled after it as fast as she could.

"Hello there Ella, what are you doing out so late?" It was Horace the bulldog going for his nightly walk. And the light, the little red light that Ella had been pursuing for so long was shining from his collar.

"Oh it helps me see in the dark," he explained. "My eyesight's not as good as it once was, and it saves me from getting hit by a car or a bicycle."

"Good idea," agreed Ella. She was delighted that the mystery of the odd little light had been solved at last. And, she could hardly wait to get home and tell Aggie the news. Imagining things, indeed. She would certainly expect an apology.