Areno (2015)

'We have to kill him', the wife and her lover thought. When three childhood friends reunite, it doesn't take long before two of them feel the woman's husband is in their way. They push him into a lake, but the boat capsizes and all three are thrown into the water. The lovers reach the shore, but the husband is nowhere. Has he drowned? They decide to wait at a lakeside hotel for his body to be found.