When Elspeth Noblin dies of cancer, she leaves her London apartment to her twin nieces, Julia and Valentina. These two American girls never met their English aunt, only knew that their mother, too, was a twin, and Elspeth her sister. Julia and Valentina are semi-normal American teenagers--with seemingly little interest in college, finding jobs, or anything outside their cozy home in the suburbs of Chicago, and with an abnormally intense attachment to one another.