The Day Off From School

Two sisters, Lizzy and Meagan are left at home alone for the day while their father is at work. The girls fool around and enjoy their time, until a random knock at the door disturbed their meal. The girls soon discover that nobody knocked, but there was a huge box right in front of their door. The girls slowly dragged it inside and when they opened it, at first they saw nothing, but then Lizzy found a golden, shined key laying at the bottom of the box, untouched. When Lizzy pulled the key out a small, old letter followed. The letter read: This golden key in front of me will lead you to another key and with that key you will seek an amazing discovery. Here's a clue that will help you to find the second key. High and low, low and high you will find me in the sky I do not fly, but I can see the world from a high. When you find me I posses the note that will put you to the test.

What will Lizzy and Meagan do? Will they leave home to search or just forget about the key? Read to find out...