Magic Tree House #46 - Dogs in the Dead of Night - Mary Pope Osborne
Beware of avalanches!
When the magic tree house whisks Jack and Annie back in time to the highest pass in the Swiss Alps, they discover an ancient monastery filled with monks and Saint Bernard dogs. Annie can't resist offering to train a wild young dog named Barry. Will Barry lead Jack and Annie to the mysterious flower they need to save a friend's life? Or will he only lead them into danger? Before the night is over, Jack and Annie will be forced to use some crazy magic! Join everyone's favorite brother and sister duo on an adventure that is scary and magical, and more fun than they've ever had!