The Helpless Spy
It seemed that industrial espionage was something he couldn't get away from no matter which world he was in.
It would be quite easy to apprehend them all or kill them if he wished. Yet, this might only result in more spies being sent.
After all, realistically, there was no way that he could constantly keep an eye on the warehouse to make sure that it wouldn't be spied upon by other forces.
Hence, the priority was to find out the motive and the origin of these three spies.
Deciding to spend more time on it, Daneel used the entire day to frequently shift positions between them in order to catch any transmission they made.
His advantage was that he had noticed that they only had trinkets which needed to be spoken aloud into instead of hearing the thoughts of those that held them.
The latter type of trinkets were quite expensive, and were hence used only in limited situations where a specific need was there.