"Jamie and Tess can't wait to return to their secret world of dinosaurs for a new adventure. But they'll have to be careful. The last thing they want is to get in the way of a herd of stampeding Triceratops!"-- Back cover.

A little boy wonders about what it would be like to have a triceratops for a pet and imagines playing fetch, teaching her tricks, and cuddling up with her at the end of the night.

Triceratopposites likes to do and say the opposite of what his parents ask him to do.