He was sleuthing out the mysterious scent in the refrigerator.
It's not like I'm an amateur at this sleuthing business.
Sleuthing mostly, but it didn't take me long to realize that most people give a lot away if you listen and observe profoundly.
However, they do exist and a bit of sleuthing will uncover them.
Finding the New York Death records you need may requiring a bit of sleuthing.