The Mystery of The Eiffel Tower

A tourist trip to Paris is turning out to be dangerous for 12-year old Aditi. It's more exciting because she will get to see the Eiffel Tower being inaugurated. But what she does not know are that dark forces are at work to stop that from happening... What is the mysterious city of Ys? Why does Aditi's father give cryptic clues of impending doom by presenting her a book of ghost stories? How can the mysterious 300 miles of catacombs six stories below Paris, where getting lost is a guarantee, help in saving the towering 300 feet giant? Why is Paris sinking underwater? And how is Aditi at the centre of this race to save the Eiffel Tower?