THEN: The formation of the UNA, the high threat of eco-terrorism, the mammoth rates of unemployment and subsequent escape into a world of virtual reality are things any student can read about in their 21st century textbooks and part of the normal background noise to Freya Kallas's life. Until that world starts to crumble.NOW: It's 1985. Freya Kallas has just moved across the world and into a new life. On the outside, she fits in at her new high school, but Freya feels nothing but removed. Her mother blames it on the grief over her father's death, but how does that explain the headaches and why do her memories feel so foggy? When Freya lays eyes on Garren Lowe, she can't get him out of her head. She's sure that she knows him, despite his insistence that they've never met. As Freya follows her instincts and pushes towards hidden truths, the two of them unveil a strange and dangerous world where their days may be numbered. Unsure who to trust, Freya and Garren go on the run from powerful forces determined to tear them apart and keep them from discovering the truth about their shared pasts (and futures), her visions, and the time and place they really came from. Yesterday will appeal to fans of James Dashner's The Maze Runner, Veronica Roth's Divergent, Amy Ryan's Glow, Laini Taylor's Daughter of Smoke and Bone, and Ally Condie's Matched.