Where does before end and after begin?

Johnny Kinross is a boy from the 1950s, a boy trapped in time, and Maggie is the girl who loves him. By some miracle and against all odds, Johnny and Maggie are given a second chance at life and love. But Johnny is freed from Purgatory only to find himself in a totally different time and place, in a world full of strangers. One unsolved mystery becomes another, and Johnny and Maggie must unravel the past to have any chance at a future. 'Prom Night in Purgatory' is the sequel to the love story that is unlike any other, where time is shifting and everything can change, and Maggie must fight for Johnny all over again.