Greetings From Somewhere -The Mystery Across the Secret Bridge

In Peru,Ethan and Ella have gone horseback riding up mountains,hiked to a famous moon temple,and met animals called alpacas .Finally they have arrived at Machu Picchu,the"Lost City of the Incas''. While the twins are exploring the ruins,they come across a secret bridge that leads them to a mysterious stone structure.What is it? Why haven't they heard about it before? And why does it seem to look like a snake,a puma,and a bird at the same time?...Read the book to find out.