George and ice satellite

The long -awaited continuation of the adventures of George and Annie, written by a brilliant astrophysicist, the author of many works about space and the most famous popularizer of science by Stephen Hawking and his daughter, scientific journalist Lucy Hawking.
In the fifth book, friends go to the training camp for young astronauts to investigate the mysterious disappearance of the satellite of Jupiter - Europe. But even in the camp itself, everything is not so simple: the tasks are exhaustingly complex and dangerous, and the head of the camp of Rick Dur, it seems, is thinking something not good. But, perhaps, the most difficult will be that in this adventure friends will be divided and overcome all difficulties along with their partners chosen for them, who, at first glance, are not the most pleasant people.
For secondary school age