Grace Williams has her future all mapped out. A high school senior in her beloved state of Texas, Grace plans to move to New York after graduation to study at Barnard College, and maybe, someday, win a Nobel Prize in biology. When she's asked to tutor Jack Nelson, the star baseball player who's flunking bio, she thinks it'll be just another activity to list on her college application. Studying turns to flirting, flirting becomes secret hook ups, and despite her expertise in bio, Grace gets pregnant. In a state where abortion is illegal, with parents who would expect her to keep the baby, Grace’s future is over before it’s begun.

With no one else to turn to, Grace must rely on her best friends, Addie and Sebastian, but anti-abortion laws put anyone who helps Grace in grave danger, and anyone they encounter might be an informant. When Grace finds a phone number and an offer of help scrawled in a bathroom stall, the three friends hatch a plan to sneak Grace across state lines. The risks to people she loves and those who have befriended her terrify Grace, but with Addie and Sebastian by her side, at least she isn't alone.

A love letter to hometowns, New York, and infinite possibilities, Biology Lessons showcases the transformative power of friendship in a world where choice is something you have to fight for.