Isa turned over the postcard and we saw that it was actually a photograph showing two women sitting outside the Hippodrome Café in Unter den Linden and one of them was Gertie, although the other was a stranger to us; she turned back and we read the message, which was short, but imbued with some meaning: We're looking forward to the fireworks when Prince Paul makes his cavalcade to meet the Fuhrer it's going to be Totally Mega – our friend, the Bulgarian, has arranged a good vantage point for us and the Americans; JAP has been measuring the coffee spoons – wish us luck! Gertie; and below her signature, a smudge which on closer inspection turned out to be a fingerprint, but not in ink – it was some dark substance pressed into a small blob of glue: we'd better get this to Carolina Moonbeam," said Isa, "her technical people will be able to tell us a lot about this," and she turned to Debbie: "is that okay?" she asked and Debbie nodded: you know, the funny thing is, in 1939 it was my Grannie and Grampa living in the house, but see how it's addressed to my mum and dad and me? there's no way she could know that we would be living there – my mum hadn't even been born then!" and Isa reminded her that Gertie had disappeared last year: "so, although she wrote and posted it in 1939, it was with with knowledge of this Time and the adynaton 'Totally Mega' is her kind of hyperbole, and she must have known a way to ensure it wasn't delivered till now!" and Debbie, excitedly said: "of course – the Postie, you know him, Whistling Jack - told my mum he'd found it tucked into a corner of the Sorting Office, but the place was renovated a couple of years ago," and Isa's eyes flashed bright: "she must have found a contraption, a Portal - she passed it through Time and Space, ensuring it was delivered now, today or a day or so either side; I wonder if there's any way we can write back to her - is Whistling Jack still on duty?" – – Milly checked her watch: "if I'm right, he'll be finishing his shift in about twenty minutes," and Isa took the decision: "Debbie, you take the card down North to our house, give it to Auntie Cristo and tell her what we've been talking about, she can call Professor Moonbeam and get it to the Lab, we'll see if we can catch up with Jack, c'mon, chop-chop!" and she started running up South, with Milly and I lagging behind and it was just as we crested the top and could see the North Eildon looming over the town, that it happened: some Smart Alecs say Expect the Unexpected – well this was one hell of an Unexpected that none of us could have Expected!