'While visiting Alaska, Ethan and Ella follow some icy paw prints that lead to a brand-new mystery'

'Twins Ethan and Ella go on an adventure in Greece, where they learn about the mystery-solving So...

Excited to be in Paris, France, twins Ethan and Ella must find a stolen painting and a secret bak...

'Twins Ethan and Ella go on an adventure in Greece, where they learn about the mystery-solving So...

Join Ethan and Ella as they travel all around the world in the first four books of the Greetings ...

With help from their cousin Harry, eight-year-old twins Ella and Ethan discover who is illegally ...

While in Machu Picchu, Peru, with their parents, eight-year-old twins Ethan and Ella cross a secr...

Separated from their parents in Beijing, China's Forbidden City, second-grade twins Ethan and Ell...

In Venice, Italy, second graders Ethan and Ella hope to find a stolen gondola and a hidden mosaic...

Second graders Ethan and Ella are sad about moving away from their hometown to travel the world w...

While in Machu Picchu, Peru, with their parents, eight-year-old twins Ethan and Ella cross a secr...

Twins Ethan and Ella are in the Maasai Mara in Kenya, where they spot lots of cool animals, but t...