Rosamund's baseball team has a very unusual second base—Oliver’s gloopy purple plastic octopus. But one morning . . . it’s gone! “Somebody stole second base,” Rosamond tells teammate Nate the Great.
With the help of his dog, Sludge, the young detective trails the missing octopus, picking up clues along the way.
It’s not easy to track down a stolen base, and Nate’s hunt leads him to some strange places before he finds himself up at bat once more.
蘿莎蒙的棒球隊有一個不尋常的二壘包，是奧利佛帶來的紫色塑膠章魚。然而某天早上它不見了！蘿莎蒙告知隊員大偵探奈特：「有人偷了二壘包。」
在小狗阿泥幫助之下，奈特一路循著線索，尋找章魚二壘包。
要找回被偷的二壘包並不容易，奈特的追蹤直覺，讓他再次就打擊位置前，去了一些奇怪的地方。