兩名警察在出警處理一樁家庭糾紛時，不慎釀成了一起槍擊意外。為了避免成為輿論的眾矢之的，他們選擇聯手掩蓋真相。隨著事態逐漸失控，他們才驚覺——監視他們的，遠不止現場的攝像頭…

　　World War II is around the corner, but the only thing Sally Bauer can think of is the ocean. Her dream is to swim across the English Channel. Her father has tried to exorcise her obsession with swimming since she was a toddler, without success. An unwanted pregnancy forces her to abandon her dream – and herself. The child’s father does not want to be involved, so as a woman in the ‘30s in Sweden, Sally has no choice but to do what is expected of her: to be a mother. There is no place left for her dreams and Sally is pulled into bottomless darkness, until her sister Carla saves her. With renewed purpose, together the sisters begin to dismantle the conventions they are constantly facing. In late August 1939, Sally stands on the shore at Dover and takes her first step into the English Channel. She swims across the open and icy sea for 15 hours, waving to the Navy who are readying for war. A couple of days after Sally swims ashore at Calais, Poland is invaded.

三兄妹同意見面商討年邁父親的未來，但重聚演變成了爭吵、嘲弄和舊怨重提。

《鋸齒狀心靈》講述的是一個女人被昏迷和奇怪的幻覺所困擾，她發現自己被困在了一系列的時間循環中，這可能與她神秘的新女友有關。