When three very different girls find a mysterious invitation to a lavish mansion, the promise of adventure and mischief is too intriguing to pass up. Ofelia Castillo (a budding journalist), Aster Douglas (a bookish foodie), and Cat Garcia (a rule-abiding birdwatcher) meet the kid behind the invite, Lane DiSanti, and it isn't love at first sight. But they soon bond over a shared mission to get the Floras, their local Scouts, to ditch an outdated tradition. In their quest for justice, independence, and an unforgettable summer, the girls form their own troop and find something they didn't know they needed: sisterhood.