Olivia Laing, a British novelist and writer on cultural and social issues, tackles the phenomenon of loneliness as a pervasive condition that is both a symptom and a cause of malaise, dysphoria and depression. The book is thoroughly referenced and has an extensive, useful bibliography. Laing begins by describing her own loneliness when she moved to New York City. Somewhat reclusive by nature, she spent hours in her apartment, connected to  the outside world through social media, email and Skype. This leads her to examine the nature of loneliness, its causes and impact on the individual. She then turns to the lives and works of artists who specifically dealt with their own loneliness -- as inspiration, subject matter and personal burden: Edward Hopper; Andy Warhol and his assailant Valerie Solanas; the artist and AIDS activist, David Wojnarowicz; outsider artist, Henry Darger; singers Klaus Nomi and Billie Holliday; tech entrepreneur, Josh Harris, and painter Jean-Michel Basquiat. Laing weaves in pertinent research (Klein, Harlow, Bowlby, Ainsworth, Weiss, Turkel) and expertly ties their findings to her subjects’ creative lives. Her section on Josh Harris’ radical social media experiments is a pertinent reminder of technology’s role in fostering loneliness. A recurrent theme is that social isolation “leads to a decline in social sophistication which itself leads to further episodes of rejection.” Among the results, she says, are that lonely people are more susceptible to sickness and more likely to die before their time.