In the novel Ordeal by Innocence, Christina “Tina” Argyle is an adopted daughter of Leo and Rachel. She came to them at age 3, and remembers no other parents. She works in the library in a Redmyn, and has her own place there. Her birthmother was English and her father was of Indian origin, and she has a calm personality.
She drives a Messerschmitt car.
She was stabbed, but survived.