Tiger, Tiger — Lynne Reid Banks

Two tiger cub brothers are torn from the jungle and taken to Rome. The stronger cub is trained as a killer at the Coliseum. Emperor Caesar makes a gift of the smaller cub to his beautiful daughter, Aurelia. She adores her cub, Boots. Julius, a young animal keeper, teaches Aurelia how to earn Boots's trust. Boots is pampered while his brother, known as Brute, lives in the cold and darkness, let out only to kill. Caesar trusts Julius to watch Aurelia and her prized pet. But when a prank backfires, Boots temporarily escapes and Julius must pay with his life. Thousands watch as Julius is sent unarmed into the arena to face the killer Brute.