The Mirror by John A. Heldt

On September 11, 2020, Ginny and Katie Smith celebrate their nineteenth birthday at a country fair near Seattle. Ignoring the warnings of a fortune-teller, they enter a house of mirrors and exit in May 1964. Armed with the knowledge they need to return to their time, they try to make the most of what they believe will be a four-month vacation. But their sixties adventure becomes complicated when they meet a revered great-grandmother and fall in love with local boys. In THE MIRROR, the sequel to THE MINE and THE SHOW, the sisters find happiness and heartbreak as they confront unexpected challenges and gut-wrenching choices in the age of civil rights, the Beatles, and Vietnam.