Elaine Magenta can solve any equation, theory, and complicated magic. But there's one thing her brilliant mind refuses to make sense of: why does her heart race every time Helena Ariana smiles at her? They met in high school—Helena was the only one who ever reached past the quiet bookworm who preferred books to people. Years later, both attending the prestigious Azalea University, fate pulls them back together. Helena is still just as warm, just as reckless, and just as impossible to ignore. As their bond deepens, Elaine finds herself changing in ways she can't explain—braver, warmer, achingly aware of a feeling she has no formula for. But Helena carries a warmth that seems to reach everyone but her, a smile she gives away too easily, and a distance she keeps just out of reach. She has always believed every problem has a logical answer. Love may be the first equation with no solution she can calculate her way into—only one she has to feel her way through, however much it costs her.