Late at night KC and Marshall are sleeping out on the White House lawn when they see suspicious lights flickering at the top of the Washington Monument. If that's not strange enough, the next day a monkey is found inside the building! KC and Marshall set off on a wild adventure to solve a 100-year-old mystery that involves a jewel thief, long-lost diamonds, and one of Washington's most famous and historic landmarks. KC和Marshall在戶外露營時，意外的發現在對面的華府紀念塔上有燈光在閃爍著，這到底是怎麼一回事呢？隔天又有一隻猴子被發現在紀念塔裡？KC和Marshall發現了一連串的謎團，他們能弄清楚事情的來龍去脈嗎？

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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