今天總統為了林肯的雕像完成正準備大大的慶祝一番，KC 跟Marshall 卻發現林肯的姆指不見了！到底是誰偷走了林肯的姆指呢？KC 跟Marshall能在派對開始之前找到小偷，找回失竊的姆指嗎？
Capital Mysteries這一系列的故事主要在描寫 KC跟Marshall在華盛頓白宮所發生的故事，同時也描寫了總統跟KC他們一家人間的互動。相當有趣的短篇小說。適合9歲以上兒童閱讀。
It’s party time in Washington, D.C.! The president is planning a celebration at the Lincoln Memorial in honor of the man who sculpted the famous statue of Abraham Lincoln. But KC and Marshall notice one thumbs has broken off the statue! Has someone stolen Lincoln’s thumb? Can KC and Marshall find it before the celebration begins?
