The #1 bestselling Magic Tree House series is ready to whisk you away through time with Jack and Annie! This time, meet famous explorer Leif Erikson and help save a narwhal! When the magic tree house whisks Jack and Annie to Greenland, they're not sure what time they've landed in, but they immediately know what their mission save a narwhal! Then they meet a young hunter named Leif Erikson and they ask for his help. But Leif has other ideas... Track the facts with Jack and Annie in the nonfiction companion to this Narwhals and Other Whales . Did you know that there's a Magic Tree House book for every kid? Magic Tree Perfect for readers who are just beginning chapter books Merlin More challenging adventures for the experienced reader Fact Nonfiction companions to your favorite Magic Tree House adventures If you're looking for Merlin Mission #33: Carnival at Candlelight, it was renumbered as part of the rebrand in 2017 as Merlin Mission #5.