As he sat waiting in a van near his estranged wife's family home in Nara, where his four children were living, James Cook felt very alone. It was an emotion he'd become all too accustomed to in the years since his wife had taken the children on a holiday to Japan and never returned, leaving him the sole inhabitant of their former family home in Minnesota.

"I was alone in our family's home," Cook says. "Alone with our children's rooms just as they left them on July 13, 2014. My location was different, but the feelings of being all alone were the same."

Meanwhile, at the his wife's family home just across the road, the most important thing in Cook's life — whether or not he would be reunited with his children — was being determined in his absence. It was Sept. 13, 2016, and after years of seemingly endless court motions, filings, petitions, decisions and appeals in both the U.S. and Japan, finally, in theory at least, he would have his children — two pairs of twins, now aged 9 and 14 — returned to him.