Since discovering the Canadian Flyer, a magical time-traveling sled, in Emily's attic, Matt and Emily have outrun dinosaurs in the Alberta badlands, evaded slave catchers on the Underground Railroad, and seen the last spike driven into the Canadian Pacific Railway. In Stop that Stagecoach!, Emily and Matt arrive in 1830s Ontario, where meet John, a young boy from Montreal who is responsible for ensuring that his pregnant mother and younger siblings reach their father and their new plot of land near Peterborough, Ontario. Together they travel rough roads through uncharted forests and down untamed rivers only to reach overcrowded inns and other unforeseen delays on their journey. To top it all off, John fears for his mother's health -- her baby is due to be born any day. Can Emily and Matt help John shoulder this huge responsibility? In this, the 13th book in the popular Canadian Flyer Adventures series, author Frieda Wishinsky weaves well-researched and accurate historical facts into her compelling, kid-friendly storytelling, while Jean-Paul Eid's action-packed illustrations situate readers in place and time perfectly. At the end of their adventure Emily and Matt share additional facts about immigrants, the threat of disease, and pioneer diets, and Wishinsky gives additional facts here too, in an informative Q&A format.