KC and her friend Marshall are watching the fourth of July fireworks with the president of the United States when they see smoke and sparks in the distance. It’s more fireworks, but they are not part of the holiday plan. They’re coming from the FBI Building! Is it just a prank? Or are these fireworks masking a bigger mystery . . . and a capital crime? KC和總統從煙火會場走回白宮時，無意間發現了從 FBI 大褸竟然冒出煙火，但這並不是節慶所安排的節目，這只是一起意外呢？還是另有隱情呢？KC 跟 Marshall 能找出事情的真相嗎？

作者簡介：

Ron Roy is the author of Random House's popular A to Z Mysteries. He lives in an old farmhouse in Connecticut with his white puppy, Pal. When he's not writing a thrilling new A to Z Mystery or Capital Mystery, Ron Roy spends his time traveling all over the country and restoring his Connecticut farmhouse. Timothy Bush is a writer-illustrator with many children's projects to his credit, including the elaborate visual extravaganza James in the House of Aunt Prudence. He lives in New York, New York.

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