The Big Bag Mistake

I read "The Big Bag Mistake".
The series is Penguin Readers Easystart.
I rarely read the book on this series, because this series have a little text and a little long for me.
The story is about same travel bag.
The woman took the man's bag on airport by mistake.
But she had stolen the bag by strange man.
There haven't any expencive clothes and money in this bag.
The man' s bag was stolen, the woman's bag was safe.
There is a address in this woman's bag.
So the woman was able to regain her's bag.
I thing it's interesting that this mistake.