Ken and Abby Gardner lost their mother when they were small and they have been haunted by her absence ever since. Their father, Adam, a brilliant oceanographer, raised them mostly on his own in his remote home on Cape Cod, where the attachment between Ken and Abby deepened into something complicated – and as adults their relationship is strained. Now, years later, the siblings’ lives are still deeply entwined. Ken is a successful businessman with political ambitions and a picture-perfect family and Abby is a talented visual artist who depends on her brother’s goodwill, in part because he owns the studio where she lives and works.