The Understudy

Sophie Hannah is the internationally bestselling author of 9 psychological thrillers, which have been published in more than 20 countries and adapted for television. Her novel The Carrier won the 2013 Specsavers National Book Awards Crime Thriller of the Year. Sophie is an Honorary Fellow of Lucy Cavendish College, Cambridge, and as a poet has been shortlisted for the TS Eliot Prize.

B.A. PARIS is the New York Times bestselling author of Behind Closed Doors, The Breakdown, Bring Me Back, The Dilemma, The Therapist, The Prisoner, and The Guest. Having lived in France for many years, she and her husband now live in the UK, where she writes from a cottage in the Hampshire countryside.

Clare Mackintosh is a former police officer and a bestselling crime author. Her books have sold more than three million copies, been optioned for television and translated into forty languages. She appears regularly at literary festivals and bookshop events across the UK and beyond.

Holly Brown lives with her husband and toddler daughter in the San Francisco Bay Area, where she's a practicing marriage and family therapist. She is the author of the novel Don't Try to Find Me, and her blog, ""Bonding Time,"" is featured on the mental health website PsychCentral.com.