Skeletons (Family Secrets, part 1).
Disguises were easy.

So was convincing people that they were seeing and hearing what you wanted them to see and hear.  Easy if your last name was Frost at least.  From her outpost in the black Mercedes with the tinted glass Kassia had no trouble seeing to it that Marrina got into the building with unfettered access to everything that lay beyond the security desk.  The building was empty of people, of course.  An attack of what some idiot news source tried to term economic terrorism had left the building closed for business but there was still a treasure trove of information on the inside.  Kassia was interested in two things: confirmation that her sister, Tina, wasn't inside and whatever suspicious devices and odd evidence might be there.

They bought it, Marrina.  You have complete access.  I suggest heading to the damage zone first and telling me what you see.  Or rather, thinking it.  I can hear you clear as day.

Her sister wanted a cheeseburger.  That she could hear clearly, too.  Kassia sighed, realizing there was a trip to a fast food place in her future.