hundreds of times now since polly's death marc has shared his experience, learned through his own parental grief with families just like michelle's, adrift and in shock. and the first order of business, said marc, repair their relationship with the police, which has become very frayed indeed. we needed help from the police. and they slowly started to let us know where they thought we should be looking. and when we pressed them, why should we be looking there? why should we be looking there? they finally said well, because that's where the cell towers take us. keith morrison: michelle le, it turns out, went on a strange journey on the evening of may 27, 2011. or at least her cell phone did. in the two hours after michelle abruptly left a training session here at the kaiser hospital in san francisco's east bay, that phone of hers left its indelible footprint through the congested streets of the east bay. and then it turned onto a two lane back