This Post by Benjamin Weiser and William K. Rashbaum is published by  The New York Times. Here is an excerpt:

The job that came in through Michael McKeever’s website was unremarkable, the kind of request he often received in his decades working as a private investigator in New York.

An international client wanted his help tracking down a debtor who had fled from Dubai and was believed to be in Brooklyn. Mr. McKeever was to surveil a house and photograph the people coming and going. “Kindly be discreet as they are on the lookout,” he was told.

Mr. McKeever and an associate began taking turns conducting the surveillance, but they failed to notice another team watching the same address. They were F.B.I. agents, and one soon got in touch with a warning.

Find the full article here.