The Catch by Yrsa Daley-Ward

From  Liveright Publishing Corporation Twin sisters Clara and Dempsey have always struggled to relate, their familial bond severed after their mother vanished into the Thames. As infants they were adopted into different families, Clara sent to live with a successful, upper-class couple, and Dempsey with a sullen, unaffectionate city councilor. In adulthood, they are content to be all but estranged, until Clara sees a woman who looks exactly like their mother on the streets of London. The catch: this version of Serene, aged not a day, has enjoyed a childless life--the very life, it seems, she might have had if the girls had never been born.As with most things, Clara and Dempsey cannot see eye to eye on the confounding appearance of this woman. Clara, a celebrity author with a penchant for excessive drinking and one-night stands, is all too willing to welcome the confident and temperamental Serene into her home. But cloistered Dempsey, who makes a modest living doing menial data entry wo