This is book number 46 in the Magic Tree House series.
The fan-favorite chapter-book series whisks Jack and Annie back in time to the Swiss Alps in search of a rare flower. When they find a monastery where monks and St. Bernards live, Annie offers to train a young dog named Barry. Then Barry runs away, and Jack and Annie have a new task to find Barry Will he lead them to the mysterious flower? Or into danger?
Mary Pope Osborne brings together just the right combination of history, magic, and fast-paced adventure to satisfy kids, parents, teachers, and librarians all over the world with her "New York" "Times" bestselling series.