Curtain Up[1] is a children's novel about a theatrical family by British author Noel Streatfeild.

However, it is clear that the stage is in their blood, as they discover talents they never knew they had: Sorrel shines at acting, Mark at singing, and Holly at dancing and impressions.

The Fossil girls also exchange letters with the Forbes children, although when Miriam, the Forbes' cousin and another student at the school, shows herself to be an exceptionally talented dancer, Posy decides to sponsor her, as well, and to communicate with Miriam instead of with Holly.

At first Posy writes to her, but stops after Miriam's talent is discovered, though she still gives her a scholarship after Madame asks so she does not hurt Holly's feelings.

Although not a true sequel, this novel contains references to the now-adult Fossil girls from Ballet Shoes, and the Forbes children attend the same school.