What does Drewe insist Miles and Harper do, now that they know what the killer is doing? What will she do in return?

Drewe insists that Harper and Miles check on the additional women from the EROS system who may be at risk or missing. She also insists that they tell the FBI if they do find any additional information from their own investigations. In return, she will not tell the FBI that Miles is in their home. She also won't go to the FBI with their theories.