Derailed (2005) on Netflix

In Chicago, while traveling in a commuting train from the suburbs to downtown, the publicist Charles Schine meets the married executive Lucinda Harris and starts a conversation after an incident with him. Charles is married, has a worn out marriage with his wife Deanna Schine and they have been saving money for years for their diabetic daughter that needs a transplantation of kidney associated to a new expensive experimental drug. A couple of days later, Charles invites Lucinda for lunch, then for some drinks and finally they begin an affair and decide to go to a cheap hotel. The room is invaded by a thief, Laroche, who steals the couple and rapes Lucinda. A couple of days later, Charles is blackmailed, but Lucinda is reluctant of going to the police since she does not want to lose the custody of her daughter. When Laroche menaces Charles' family, the executive tries to solve the problem and the situation gets completely out of control.