About next lives

In Gita it is a vast subject about death.in other realigns did not shed light on this subject.and now a days this opinion is for most in western countries.as last year i saw a movie based on Bhagwat gita in u.s.a.It was a story of a young girl who reborn in an other state of U.S.A.it was a real story.she describes every event of her previous life.
according to this theory death is the name of leaving the subtle to physical body.it is also narrated in Maharishi Ramana's biography when he was on walk with a devotee.he lay down on a mountain and his subtle body left his physical body.devotee began to weep and his physical body became dark.maharishi was looking this all in his subtle body.but after some time his subtle body entered in his physical body.this is not very uncommon in siddh purshas.
Now what is the effect of these three gunas at the time of death to reborn,we will understand this by 14th solaka.the subtle body is our blue print[seed]to grow in other birth.