detective work

US /dɪˈtek.tɪv wɜːrk/
UK /dɪˈtek.tɪv wɜːrk/
"detective work" picture
1.

the work of a detective; investigation, especially to solve a crime or mystery

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It took a lot of detective work to figure out who stole the cookies.
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Her job involves a lot of detective work, piecing together clues from various sources.
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investigationsleuthinginquiryresearchprobing
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detectiondetectdetectivedetectabledetective storydetection dogworking