Twin Studies is a novel that explores the complicated bonds between twins and siblings, friends and lovers; the role of class and money; the nature of gender, sexuality, and gender fluidity; and the messy complexities of modern family life. Dr. Erica Bauer -- an identical twin -- studies twins at the university in Vancouver. Through the course of her research, she meets a set of fraternal twins who are evidently fraternal, but who insist emphatically that they are identical. Their mother, Karen Oxley, is a West Van single mum whose life is on the wrong road -- and who discovers an urgent need to put it back on the right one. As Erica sets out to help the twins, their lives become increasingly intertwined in unexpected ways.