The phrase "detective work" refers to the process of investigating or solving a mystery or crime by carefully gathering clues and evidence. It involves thinking logically, analyzing information, and actively searching for answers. Full definition
The good news is that it can be a fun piece of detective work with great rewards. (johnleemd.com)
There are many reasons for fur loss in cats and sometimes it takes a little detective work on your part to find out which one your cat is suffering from. (second-opinion-doc.com)
You have to be a bit careful with this one, because you don't want to sound like some kind of private detective working on a case. (sciencemag.org)