The Killing (2011)

In Seattle, Det. Sarah Linden is on what is supposed to be her last day on the job. She and her son Jack are supposed to leave that evening to join her fiancé in Sonoma. Her replacement, Det. Stephen Holder, is ready to take over but they answer a call from a patrol car who have found a bloodied sweater in a field. When the missing girl, Rosie Larsen, is found in the trunk of a car at the bottom of a lake it turns out the car is registered to the campaign committee for councilman Darren Richmond, who is running for mayor. Linden delays her departure for what she hopes will be only a few days.