Mandie is given permission to travel to Europe, but during the voyage she and Celia are puzzled by mysterious happenings aboard the ship.

The first night Mandie is at the White House she hears something in the hallway and is convinced that she sees George Washington-- who's been dead for 200 years! In the nights that follow, she sees him again in different places. What's going on?

Mandie accompanies her grandmother to Europe, and finds herself relying on her Christian faith as she gets involved in another mystery when objects start to disappear from her steamship cabin.

Mandie goes home for the Christmas holiday and finds a very special present waiting for her.

Mandie has mixed feelings when she returns home from boarding school to find a new baby brother. Her mother seems to be so wrapped up in the new baby that Mandie allows herself to wonder if her mother doesn't love her anymore. Feeling sorry for herself, Mandie packs her few belongings to leave, despite her Uncle Ned's advice.

After visiting with her Cherokee relatives, Mandie receives word from Jonathan Guyer about a mysterious secret, but when she tries to find him, she learns that he has fled to Long Island, so she decides to find out the secret for herself.