When Serena's family moves fifty miles to a wilderness area in Canada, they think that they have left their cat Moses behind, but then they receive a surprise visitor.
Josh, newly come to the Yukon, sets out to investigate his friend Gabe's story that Trapper Jack's left big toe is in a tobacco tin behind the bar of the Sourdough Saloon.
Describes the life and travels of Jacques Cartier, the sixteenth century French navigator who made three voyages to what is today known as Canada, in search of a northwest passage to China.