十三年前，因為一場追殺，林源等七個人被困在一個只有黑白兩色的地方，幾人耗費了七夜才得以離開，但是脫困後每人對此只有一天的記憶。十三年後，一段摩斯電碼預示著間隔十三年的殺人遊戲又將繼續。十三年後的七天時間裏，林源先後見證了當年七人裏有人自殺、有人精神症發、有人被害身亡。人人互相懷疑。林源通過對十三年前七個夜晚的各自回憶，以及十三年後七天內發生的一系列詭怪事情，終於找到掩藏在所謂"真相"後面的真相，然而最終的結果卻讓他駭然。
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