A wave of jewelry thefts is committed in broad daylight and without any trace. When grandma's old and beloved family necklace vanishes, Timmi, Lilli and Marvin set out to catch the phantom known as the Invisible Thief.
In typical Timmi Tobbson fashion, each Junior book offers solve-them-yourself picture mysteries, but that's not all. Accompanying the story is additional content aimed at sparking interest in technology, history and science in general.
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