Théo and the aliens

Astronomy, astrobiology and artificial intelligence are what the 7th volume of The Adventures of Théo are all about. 

One night, while playing outside, Théo, Benjamin and Electre notice a strange triangle of light in the sky, then a mysterious drawing in a wheat field the following day. Grand-Pa, a famous cryptologist, interprets the message: extraterrestrials want to communicate and have provided some GPS coordinates. Our four heroes head to those coordinates, where, at the appointed hour, a flying saucer lands…