Amber Lake (2011)

Three half-sisters, after being invited to their father's lake house to meet him and each other for the first time, are each questioned by a local sheriff to explain the events that took place leading up to the discovery of their father floating dead in the lake. Using a Rashomon effect, each sister gives a slightly different account of the events, with each version pointing a finger at a different sister, while the sheriff must sort through the details to find out what really happened. What he discovers in the end is not what he expected.