“What’s wrong?” Kim replied, also in a low voice muffled by the snood, which he then sensed her tug down off her face.
He explained the dilemma.
“Hmm, good point. I hadn’t thought of that.” She fell silent for a moment, then said, “I reckon… I press the buzzer, speak to him, and get him to let us in. Only when we’re behind closed doors do I switch off the invisibility. God, that sounds clunky. Switch it off. Maybe that’s something else we need to come up with a word for. If anyone did happen to see Smith opening and closing a door when there was nobody there, it’d be a lot easier to make up something about a faulty buzzer, or him mistakenly thinking he heard the buzzer, rather than trying to explain the fact two people—attached to each other by straps and bungee cords, no less—literally
