To give this story the "bestseller" feel on Amazon, the description needs to hook the reader with the contrast between Elara's "Smooth" world and Silas's "Ugly" reality.
Since we are leaning toward those two titles, here is a description that works for both:
A masterpiece on the Hill. A king in the wreckage. And a truth that will burn both their worlds to the ground.
Seventeen-year-old Elara Vance lives in a world of filtered air, silk gowns, and "smooth" lies. As the crown jewel of Oakhaven's elite, her only job is to stay perfect so the cracks in her father's empire don't show. But masterpieces are fragile, and Elara is tired of being made of glass.
Under the rusted shadows of the Blackwood Bridge, she finds the only thing that's ever felt real: Silas Jude.
Silas is everything the Hill fears-scarred, grease-stained, and fueled by a righteous hunger for the truth. He doesn't belong in Elara's world of diamonds, and she doesn't belong in his world of scrap metal and river mud. But when Elara discovers the dark secret connecting their families, the divide between the "Smooth" and the "Ugly" disappears.
Now, they are on the run with a ledger that could ruin Oakhaven's powerful elite and a target on their backs. To survive, Elara will have to shed her silk and learn the physics of the fall. Because when you're plummeting at terminal velocity, the only thing that matters is who is there to catch you at the bottom.
The bridge is on fire. The glass is shattering. And there is no going back.