約罕和史帝在班上總是被同儕排擠。一天，班上的同學打球弄傷了史帝，約罕明明知情卻不告發他們的惡行。善良的史帝不以為意，仍邀請約罕參加他的生日派對，但約罕卻對史帝提出參加派對的唯一條件：史帝必須進入了地窖，找尋一則恐怖傳說…。 Cairn is a dark film on adolescence in which Johan faces a moral dilemma after a seemingly innocent prank. The story unfolds on a psychological level in the turbulent transition between childhood and adulthood.