The protagonist of the story is Dolly, a female Dolichorhynchops, who travels the Kansas Inland Sea, 82 million years ago during the late Cretaceous period with her family. She gets attacked by a shark (Cretoxyrhina) which kills her mother; and is then killed by a Tylosaurus. Dolly survives with a tooth embedded in her flipper. Later, Dolly's brother is swallowed whole by a young Tylosaurus, then an older Tylosaurus kills the younger one, leaving Dolly alone. Then she becomes a mother and has three young of her of own.

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