Then comes Day. Not a person, but a permission. Day is what happens when Sienna stops worrying and tilts her face toward the sun. Day is the long light of 2 p.m., the hour of errands and small mercies, of coffee cups left half-full on railings. Day has no last name because she needs none; she simply stretches herself thin across the hours until the shadows grow long.

But Tina is the one who interrupts. Tina is the sister who shows up unannounced with a six-pack and a story about the man at the gas station. She laughs too loud in quiet libraries. She borrows your sweaters and returns them with new holes. Where Sienna is patient and Day is endless, Tina is restless—a flicker of neon in a watercolor sky. She is the name you shout across a crowded parking lot, not because you need her, but because you can.

And Kay? Kay is the letter left at the end of the alphabet, the quietest one. Kay is the woman who watches from the porch while the other three argue about directions. She is the keeper of secrets, the one who knows that Sienna once loved a man who painted houses, that Day is afraid of the dark, that Tina still cries in the shower. Kay is the hush after the last firework. She is the tide pulling back to reveal the wet sand.

Four names. One woman. The whole damn sky.