APB Missing Investigator

There were a couple of investigators on my mission on whom we would have liked to placed an all-points bulletin. In fact, it seemed like a sick running joke with my investigators that if they should any sign of progress, they would disappear into the ether. 

One investigator was hit by a car and spent a month in the hospital with no way to contact us. Another just vanished (we never met him at his home). And a third got summoned to the Vatican to meet with some Catholic bigwigs and was so spooked by the call that he never had anything to do with us again.