《消失的她》插曲是《By Your Side》，歌词如下：
You think I'd leave your side baby? You know me better than that, You think I'd leave down when your down on your knees? I wouldn't do that, I'll do you right when you're wrong, ha ah ah ah If only you could see into me, oh, when you're cold, I'll be there to hold you tight to me, When your on the outside baby and you can't get in.
I will show you, you're so much better than you know, When you're lost, when you're alone and you can't get back again, I will find you darling I'll bring you home, If you want to cry, I am here to dry your eyes, and in no time you'll be fine, You think I'd leave your side baby?
You know me better than that, You think I'd leave down when your down on your knees? I wouldn't do that, I'll do you right when you're wrong, ha ah ah ah If only you could see into me, Oh when you're cold, I'll be there To hold you tight to me, Oh when you're low, I'l be there by your side baby。
《消失的她》角色介绍：
1、何非
潜水教练。何非在一次潜泳时，救了遇险的李木子。两人因此结识并发展成恋人关系，原本是个赌徒的何非决心戒赌，在李木子帮其还清了所欠的赌债后，两人结婚了。结婚周年时何非带着李木子去东南亚旅行，结果李木子却离奇失踪了，何非焦急万分的跑到警局要求立案却被拒绝，就在此时，一个自称是李木子的女人突然出现在其面前。
2、假李木子/Jane
真名Jane，自称何非妻子的神秘女子。尽管遭受到丈夫何非言语上的恐吓，但在面对调查时，李木子还是会耐心地为因神经问题而暴躁的丈夫进行解释，温柔的眼神中充满关心。而在与丈夫晚餐的独处中，李木子却好似换了张面孔，充满攻击的眼神散发出危险气息，言语之中更是暗藏杀机，让人不寒而栗。