The third mystery about intrepid adventurer, Amelia Cheeseheart and her sidekick Webster, who solve an icy mystery in the museum!

Amelia and Webster are going camping in the Ice Age exhibit, but when they arrive, they discover that all the cave mice have disappeared. Then the bellow of a terrifying beast scares Webster away in a terrible panic! Desperate to find him, Amelia enlists the help of famous mouse adventurer Stilton Jones, and together they agree... it's time to investigate!