It was at that point that Jenny came running through the front door of the surgery downstairs, breathless and frustrated.

"Dad?! Martha?!" She'd followed Martha's location dot on the map, changing directions twice as Martha had moved around and eventually -- thankfully -- met up with her father's dot. She'd had to double back to get to the surgery, but both dots were there now, unmoving. Whirling around in a circle, she could see no one, but there were back rooms, and Martha lived upstairs. Worried, she called out again.

"Dad!"