The bonds of sisterhood were unbreakable. Until him. Hannah and Stef have always been there for each other. Growing up in a loving family, they're stunned to discover their mother adopted out a child before their parents met. When Alex walks into their lives, the sisters are seduced by his charm, wealth and social status. But as they rush to make up for lost time, it soon becomes apparent their half brother's agenda is more complicated and sinister than the Fidler sisters could have imagined. A novel about loyalty, secrets and the insidious effects of coercive control, The Half Brother asks, do we really ever know those we love the most?