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Sam and Julia discover a mysterious object buried in the ground. A human dice? What could it be used for? No one knows what it's used for among mice.

The feather of a rare bird brought back from Julia's island escapes her hands and flies into the stairwell. A chase ensues on the various air currents.

Suspecting that the other's life would suit them better, Sam and Julia swap homes for a few hours. But is someone else's life really more enviable than their own?

Sam becomes convinced that Julia admires his big brother Dan more than she does him. He tries to change his behavior and personality, but is this really a good idea?

Julia has caught 'la souricelle' - chickenpox for mice. Contagious, she can no longer see Sam and is very bored.

To prove to Sam that she too can do magic tricks, Julia discreetly hires Sam's little brother Ben to pretend to obey her every command.

Rain is interfering with Sam and Julia's play plans. Since a rainbow follows the rain, why not make one to encourage the rain to stop?

Sam and Julia find themselves locked in their lair with Julia because of large objects dropped on their doorstep. How do they get out? They discover... a secret passage.

Sam and Julia grow a plant from a seed brought back from the islands. According to legend, the fruit of this plant is supposed to give courage. Sam would need it to dare to get back on his scooter.

The noises on the roof that kept Julia awake the night before came from the footsteps of Miss Cosmos, who had gone upstairs to observe the night sky.

After an unsuccessful attempt to imitate Ella's ballet moves, Julia discovers that she can dance very well in her own way.

After accidentally damaging the last pages of the book Sam has been passionately reading, Julia has to reinvent the ending for him.

How to repair Ella's doll, unintentionally damaged by Sam and Julia, and replace it without her noticing?

It's Ella's birthday. What could Sam and Julia possibly offer someone who already has everything?

Boxes have been stored in Sam and Julia's secret lair. When they discover that they belong to Uncle Ramastout, to avoid being invaded, they have to find a way to clear out his workshop to make room.