It's Tim's birthday. Instead of a package, Tim gets a mysterious letter -- written in code! It begins: "When the moon comes up , look for the biggest star." Tim -- and the reader -- are off, following the clues. And at the end of the treasure hunt is a wonderful birthday surprise!
今天是Tim的生日，他没有收到任何礼物，但是，他收到了一封信，里面全部都是神秘的符号。这可是一封用密码写成的信！ Tim必须解出正确的答案才能找到神秘的礼物，在重重提示后等着的是什么呢？读者们一起帮Tim找到正确答案吧！