When the Wollstonecraft Detective Agency is approached by famous fossil hunter Mary Anning, the team know that this could be their most important case yet. Mary Anning’s precious dog has been snatched - to get her back, the kidnappers demand she lie about fake dinosaur bones, and pretend they are genuine.

Now the Wollstonecraft detectives have just three days to track down the fossil fakers, and save the integrity of science! The game is afoot - blood-sucking leeches, smoke bombs and diabolical disguises abound. And behind the lies and fakery, a genuine criminal may finally be revealed …