The Mummy's Gold is a novella written by Kate McMullan. It was first published in 1996 as a part of the Eek! Stories to Make You Shriek! series.
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Jake knows something is up when his older brother offers to take him to a movie called The Mummy's Gold, so when a mummy shows up asking for all of Jake's money he is convinced that it is just another one of his brother's pranks.