Fiction and nonfiction elements combine (sometimes confusingly) in this look at the Underground Railroad. The introduction provides straightforward information, but the bulk of the book recounts the adventures of two fictional characters who escape from slavery, meet on their journey north, and make it to Canada in 1858. Though the author states up front that Callie, a 14-year-old field worker from a plantation, and William, a city slave owned by a merchant, are not real people, the historical photos that accompany this pronouncement downplay that point.Fiction and nonfiction elements combine (sometimes confusingly) in this look at the Underground Railroad. The introduction provides straightforward information, but the bulk of the book recounts the adventures of two fictional characters who escape from slavery, meet on their journey north, and make it to Canada in 1858. Though the author states up front that Callie, a 14-year-old field worker from a plantation, and William, a city slave owned by a merchant, are not real people, the historical photos that accompany this pronouncement downplay that point.