The question of how to find Brian Miller was posed to me, and he still has not been found, seen or heard from, so I will put this question to the Tarot, and see if any new ideas result.
We start with Temperance, crossed by the four of pentacles in answer to the question of how Brian can be found. So it looks like we have the beginnings of a good mixture of investigative skills suddenly shut down, via information being withheld, for some reason. Beneath this is the ten of wands, reversed, which bespeaks duplicity. But is this on the part of law enforcement or a witness? The next card is the ace of pentacles. Somehow, this seems like a lead or a tip, when it appears in relation to this question. As a location, it refers to earth, and possibly a small flower garden.
A distinct possibility here is described by the eight of pentacles, reversed, which tells me that we are looking at an unethical use of skills somewhere in the investigation, so that helps to answer the question concerning who would withhold information. This is followed by the seven of cups, which is delusions of grandeur, or lots of discussion about unrealistic possibilities. So a definite problem exists in the investigation.
The Knight of Pentacles appears in the place of fears. There is some perceived reason for someone to be afraid of Brian being found. In the place of environment, we have the High Priestess, reversed, which is feminine influence and superficiality. Somewhere, connected to this case, is a woman who delivers half truths and gets away with evasiveness with law enforcement. Not enough is known about her connection to Brian's case to force her to testify. Also, as a location, the seven of cups and the High Priestess would indicate water. I would say water, pillars, palm trees, and perhaps a statue. The three of cups appears as a desire, which is obviously the desire to find Brian and have a happy ending to this story. It is also another water card, but this time, it's mundane location description is, once again, of a garden; possibly at an estate or a house where lavish parties have been thrown. The last card here is the Queen of Swords, letting us know that in order to cut to the chase, a court order will be required. This Queen represents legal or judicial authority; she may be a prosecutor or a judge. It may be a good idea to write a letter to whoever oversees the agency responsible for the investigation, or for Brian's family to contact their state representative, and get the ball rolling that way.