Vivian Versus the Apocalypse (Vivian Apple #1)
Katie Coyle

Viv is determined to carry on as normal, but when she starts to suspect that her parents might still be alive, she realises she must uncover the truth. Joined by Peter, a boy claiming to know the real whereabouts of the Church, and Edie, a heavily pregnant Believer who has been 'left behind', they embark on a road trip across America. Encountering freak weather, roving 'Believer' gangs and a strange teenage group calling themselves the 'New Orphans', Viv soon begins to realise that the Rapture was just the beginning.