"Perhaps she is having her evening hate," suggested Mollie.

"She does take awful fits of the sulks sometimes," Prudence allowed, "but I don't think she would be sulky with me just now; it wasn't me that stole the ladder—oh bother that Hugh! We had better go and look for it as fast as we can. I wonder where he has hidden it?"

"It can't be far away, because he was only gone for a few minutes at tea-time," Mollie remarked sensibly. "Very likely it is simply lying on the ground behind the wall."

That was precisely where it was, and without much trouble the girls got it into place again, and Prudence mounted quickly. She disappeared through the little door, but in one moment appeared again with a frightened face.

"She's not here, Mollie. She's gone."

"Gone!" Mollie exclaimed incredulously. "She can't be gone! How could she get down without the ladder? She must be up in the tree."

"No, she isn't. I can see every branch from here; there is not a single place where she could hide."

"But she must be up there somewhere," Mollie persisted. "If she had fallen out she would be lying round somewhere. There is no way she could get down without the ladder. She is so nervous. I'll come up too and look."

"You may come, but you won't see anything," Prudence said, steadying her end of the ladder while Mollie climbed.

The Nest was certainly empty. The little blue bird must have found wings and flown, Mollie thought. She looked up and down and round about, but not a vestige of Grizzel was there to be seen. Then she called her Scouting lore to her aid, and set her wits to work.