WHEN ZOE WALKER SEES HER PHOTO IN THE CLASSIFIEDS SECTION OF A LONDON NEWSPAPER, SHE IS DETERMINED TO FIND OUT WHY IT’S THERE. THERE’S NO EXPLANATION: JUST A GRAINY IMAGE, A WEBSITE ADDRESS AND A PHONE NUMBER. SHE TAKES IT HOME TO HER FAMILY, WHO ARE CONVINCED IT’S JUST SOMEONE WHO LOOKS LIKE ZOE. BUT THE NEXT DAY THE ADVERT SHOWS A PHOTO OF A DIFFERENT WOMAN AND ANOTHER THE DAY AFTER THAT. IS IT A MISTAKE? A COINCIDENCE? OR IS SOMEONE KEEPING TRACK OF EVERY MOVE THEY MAKE.