Macmillan is closed today for an unspecified “security incident” that occurred on Saturday. They write in a statement: “Macmillan became aware of a security incident that impacted our servers and internal systems. While we immediately responded to secure the threat, our work is ongoing. Out of an abundance of caution, we have closed our offices Monday, June 27 to allow us time to continue our investigation, and are working diligently with third-parties to return to a secure working environment.”