From all the information gathered I would suggest:
– Missing You (works on several level depending on who the sentence refers to or who us doing the miss – if that makes sense)
– The Other You
– The Way Home (again can be interpreted on several levels)
– Little Girl Lost (again lost can be interpreted on several levels)
– Here Ends the Innocence or The End of Innocence
For me ‘Seven’ just reminds me of the film and also makes me think of Thirteen which was a series but covers a similar subject.