When Mara Ellison's mother marries into the Cole family, she gains a stepfather, a new last name on the horizon, and a stepbrother she never asked for — Jonah Cole, infuriating, magnetic, and completely off-limits.They agreed on the rules the night of the wedding: keep it friendly, keep it distant, don't make this weird for their parents. But rules are easier to make than to keep, especially when you're living under the same roof, showing up to the same family dinners, and catching each other's eye across a table you're not supposed to want to reach across.Every text he sends feels like it means more than it says. Every room he walks into gets smaller. And the one thing Mara knows for certain — the one boundary she promised herself she'd never cross — is starting to feel like the only thing she can think about.