All 6 Uses

inquiry
in
The ABC Murders
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The police have all the means at their disposal for that kind of inquiry.†
Chpt 8 *

inquiry = questioning or investigating
You'll want to make your own inquiries, Crome," said the superintendent.†
Chpt 9

inquiries = questions or investigations
Does any line of inquiry suggest itself to you?†
Chpt 13

inquiry = questioning or investigating
He answered Poirot's look of inquiry.†
Chpt 14
The routine inquiries, the police make them better than I do.†
Chpt 17

inquiries = questions or investigations
One little inquiry there-that is all.†
Chpt 32

inquiry = questioning or investigating

Definitions:

(1) (inquiry)
a question or investigation -- especially one meant to gather information or find out the truth
(2) (meaning too rare to warrant focus)