Mimi is determined not to give up on anyone or anything, but since Mammy died, her father never smiles, her sister Sally is in a bad mood, brother Conor keeps to himself, and even Sparkler the dog does not want to go for walks.
Ella meets a talking frog who tries to convince her to kiss him so he can turn into a prince, but after playing with her, he begins to question his wish.
Charles and Lizzie go to the dog show with their Aunt Amanda and agrees to take care of Ziggy, a dachshund puppy whose owner has too many dogs to take care of, until he can be placed in a permanent home with a new family, but Ziggy runs away and Charles is determined to recover the lost puppy.
On a trip to Pennsylvania, presidential stepdaughter KC Corcoran and her friend Marshall are exploring the rest of the train when the special caboose at the back disappears--along with the Vice President.
When Rotten Ralph, the cat, fails to win a spot on a baseball team with his friend Sarah, he becomes the "cat boy" instead, still dreaming of proving himself the superstar he imagines himself to be.
KC and Marshall run across a forgotten cubbyhole while painting a closet at the White House and find a box of toy horses that once belonged to Thomas Jefferson; when they go to Monticello to return the horses, the box disappears, and they explore the building and grounds to find the thief.
