gumshoe

Gumshoe came to him in the past unaware.

悄悄走过去给他来个措手不及。

There's a big difference between great white sharks and serial killers and it comes down to that old gumshoe standard: motive.

大白鲨和连环杀人案凶手之间有着巨大的差异，但是归根到底这又是那种刑警所有的陈旧老套的说法：动机。

And if they sense a whodunnit, they happily turn gumshoe.

如果觉察到可疑的蛛丝马迹，他们很乐意变身成为侦探。