《Let The Right One In》原聲由 Johan Söderqvist 作曲。
12歲的男孩Oskar獨自承受著他人的欺負和離異雙親的忽視。直到他的新鄰居，一個蒼白神秘的小女孩Eli走入他的生活，成了Oskar的守護天使，讓他孤獨的生活有了依靠的對象。即使Oskar知道了Eli的真實身份，但恐懼卻沒有將他帶離Eli的身邊…

《Let the Right one in》改編自瑞典小說家約翰·林德科維斯特（John Ajvide Lindqvist ）2004年的同名暢銷書，電影劇本由原著作者約翰·林德科維斯特（John Ajvide Lindqvist ）親自參與改編。而本片的英文片名“Let the Right one in”則借用了著名歌手Morrisey的歌曲名“Let the right one slip in”——用來講述一個吸血鬼受邀進入一個家庭的故事。
如果你喜歡Let the Right One In的專輯《電影原聲 - Let The Right One In(生人勿進/血色入侵)》里的歌曲，可以把下面的歌曲連接發(fā)給你的朋友:
1.The Arrival - Let the Right One In
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2.Eli and Oscar - Let the Right One In
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3.Eli's Theme - Let the Right One In
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4.The Slaughter - Let the Right One In
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5.Oscar In Love - Let the Right One In
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6.Hiding the Body - Let the Right One In
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7.After the Fight - Let the Right One In
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8.Oscar Strikes Back - Let the Right One In
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9.Virginia Wakes Up - Let the Right One In
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10.The Father - Let the Right One In
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11.Spotting A Victim - Let the Right One In
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12.Giving Up - Let the Right One In
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13.Death of Hakan - Let the Right One In
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14.Virginia Is Bitten - Let the Right One In
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15.Then We Are Together - Let the Right One In
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16.Virginia In Flames - Let the Right One In
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17.Eli Bleeds - Let the Right One In
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18.Related by Blood - Let the Right One In
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19.Lacke Dies - Let the Right One In
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20.Going Home - Let the Right One In
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21.Let the Right One In - Let the Right One In
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