Steven (Colin Farrell), an eminent cardiothoracic surgeon is married to Anna (Nicole Kidman), a respected ophthalmologist. They are well off and live a happy and healthy family life with their two children, Kim, 14 (Raffey Cassidy) and Bob, 12 (Sunny Suljic). Steven forms a friendship with Martin (Barry Keoghan), a fatherless 16 year-old boy. Things take a sinister turn when Steven introduces Martin to his family, forcing Steven to make a shocking sacrifice or run the risk of losing everything.
