The Astonishing Stereoscope
by Jane Langton | 
The Mysterious Circus
by Jane Langton | 
The Dragon Tree
by Jane Langton | 
The Fragile Flag
by Jane Langton | 
Bottersnikes and Gumbles
by S. A. Wakefield | 
The Magic Faraway Tree
by Enid Blyton |
An Enemy at Green Knowe
by L. M. Boston | 
The Silver Crown
by Robert C. O'Brien |
The Enchanted Wood
by Enid Blyton |
The Land of Green Ginger
by Noel Langley |
Down the Bright Stream
by D. J. Watkins-Pitchford | 
The Cuckoo Tree
by Joan Aiken | 
Nightbirds on Nantucket
by Joan Aiken | 
Dangerous Games
by Joan Aiken | 
The Steps up the Chimney
by William Corlett | 
The Battle for the Castle
by Elizabeth Winthrop |
Dandelion Fire
by N. D. Wilson | 
The Secret of Castle Cant
by K. P. Bath | 
The Diamond in the Window
by Jane Langton | 
The Time Bike
by Jane Langton |
When Prince Krishna is called away, he leaves behind some strict instructions for the Hall children about one of the openings in the mysterious summerhouse: Keep Out! As Eddy and Eleanor swing through each of the other openings, they refuse to break the rule, even as their temptation grows. But when Oliver and little Georgie disappear through the forbidden archway, Eleanor and Eddy know that they must either break their promise or risk never seeing their friends again.