Amy and Christopher are twins AND international sleuths. Their eco-photographer parents travel often. So the twins fly to meet them.<br /> <br />Christopher loves drawing. He draws people and places. And often he notices unusual clues.<br /> <br />Amy reads and thinks quickly. She also collects coins, stamps, stickers, phone cards and clues.<br /> <br />Together they solve mysteries in the air and at international airports.
Five people, from different parts of the Earth, have found themselves inside a strange train. Then a man, called «The Alternate», has suddenly appeared. He confesses that he is the one who brought them here. Only for one purpose: collecting five sacred keys scattered and hidden around the series of worlds. Whether these five people would accept this task or not, they cannot change the fact that their adventure has begun.
Trekking with their eco-photographer parents, Amy and Christopher suspect a thief on New Zealand's famous Milford Track.<br /> <br />Is it Ms Tree, the Freedom Walker? Other suspects include a keen golfer, a rugby international and Zoe, the guide. When a mischievous kea bird steals from the twins, they change their minds. Dr Al, the celebrity explorer is being filmed on the Track, by their parents. Could he be involved in illegal kea or nugget smuggling?<br /> <br...
