He was used to it as far as it went, leaving the lab to find the place empty, be it because it was it a silly time in the morning or they where on rescues and he wasn't needed for consultation, but there was generally a note, a message. Something.
Today was different though, he had emerged from his den, summoned by the sound of a rescue. When he realised he wouldn't be needed he had returned to it. Several hours later when the growl of his stomach demanded something had left again, finding the villa cold and dark and empty. None of the boys, Grandma was gone and so was Kayo, he was alone.
He called John but found the call remained unanswered, the middle child was getting more and more distant, not that the others would listen, but this was not the time to be dealing with that.
What could he do though?
He tried Gordon but again the call was left unanswered. He sat and thought for a long while before the roar of an engine informed him of the others return, hopefully with answers of some sort.