内容简介：
"Luck always runs in sets of threes. It can be good luck or it can be bad luck, but luck always runs in sets of three." This exciting sequel follows the continuing adventures of Jon and Sara Kline, now apprentice time travelers. An unexplained burp in the timeline sends the two time travelers back on a mission to find out why history changed. Within their mini-adventure, they discover the gateway man. He is a time traveler from the future with a superior time machine. The man has totally evil intentions. He is stealing objects from the past without regard for the consequences to history. Consequently, Jon and Sara's history is flip-flopping from bad to worse. Two time machines are one too many and the duo's time traveling career depend upon stopping the gateway man. The exciting conclusion is literally out of this world.