One day, a paleontologist called "Dr. Diggery Bone" arrives on the Dearly Farm and offers to purchase it, claiming that he's on the trial of the bones of a "Cruella-Saurus Rex", whose bones he claims to be where the Dearly Farm is.
The truck arrives at a theatre, in Gruteley, where they see that Dr. Bone rehearsing a performance of Hamlet, showing that he is just an actor to the Dalmatians.
Dr. Bones then drives to Villa DeVil, where the Dalmatians learn that Cruella has hired the performer as part of a plan to get the Dearly Farm. Lucky tries to think of a way to tell Roger and Anita about this as Spot tries to show Lucky the Hamlet poster.
Rolly, in an attempt to get one of the bones on the Cruella-Saurus, accidentally causes it to fall on top of Cruella, who orders Dr. Bones to catch the Dalmatians.
Back at the Dearly Farm, Anita has just phoned the university, who claims to have never heard of a "Dr. Diggery Bones." When the Dalmatians come in with the performer following behind, the pups show the Dearlys the poster. Roger and Anita decide not to sell the Dearly Farm to the performer, and he is scared off by Pongo.
The Dalmatians eye Cruella chasing the performer with one of the bones from the Cruella-Saurus.
- Spot is referred to as a "he" in this story, despite being female.
- This is a book based on 101 Dalmatians: The Series, with others including Cruella Returns, Springtime Fun, and Hide-and-Go-Seek at the Farm.
- The name "Cruella-Saurus Rex" is obviously based on the name of the real Tyrannosaurus Rex.