Graduate from junior detective to master sleuth! First try these super cool secret tips and tricks for digging up clues:<br/>Write with invisible ink...<br/>Tell the distance between you and a suspect...<br/>Conceal important messages...<br/>Use hand signs 6 different ways...<br/>Find and analyze fingerprints and footprints...<br/>See through frosted-glass windows...<br/><br/>Then put your new skills to the test by answering the Thriller Questions at the end of the book. Once you're on the trail using the techniques you've learned here, any mystery will be as good as solved!
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