Calamity, une enfance de Martha Jane Cannary

1863, United States of America. In a convoy traveling west with the hope of a better life, Martha Jane's father is injured. She is the one who has to drive the family cart and look after the horses. The learning is tough and yet Martha Jane has never felt so free. And as it is more practical for horse riding, she does not hesitate to put on pants. This is too daring for Abraham, the leader of the convoy.

Accused of theft, Martha is forced to flee. Dressed as a boy, looking for evidence of her innocence, she discovers a world under construction where her unique personality will assert itself. An adventure full of dangers and rich in encounters which, step by step, will reveal the legendary Calamity Jane.