In the magic treehouse series, not only in Merlin Missions, Jack and Annie found a magic treehouse. They soon discovered that in the magic treehouse there were lots of books and when they point to a picture in the book and make a wish to go there the magic treehouse just magically transports them there! They soon learned that the treehouse belongs to Morgan Le Fay from Camelot. Jack and Annie have helped Morgan with a humongous amount of missions in all places and time periods with the help of the magic treehouse. However in Merlin Missions it is not however Morgan that sends them on these missions. It is Merlin, a fantastic magician. During Merlin Missions, Jack and Annie make two friends named Teddy and Kathleen. They soon completed four missions that showed they could properly handle magic. On those missions, they were given a book of ten magic rhymes to use on four missions. Each rhyme can only be used once. Since they succeeded in those four missions, they were given the Wand of Dianthus. A magic wand that could create magic. On this mission, Jack and Annie are going to find the final secret of happiness for Merlin to cheer him up. They already found three secrets of happinesses so this is their fourth and last mission to find a secret of happiness to cheer Merlin up! On this mission they need to be quick though, because Merlin is falling very quickly. Soon he will disappear!
In this book Annie was just taking a picture of Jack for her family project for school when Jack saw a light shoot towards the woods! They decided to see if the magic treehouse was back, and it was! They meet their friends Teddy and Kathleen and they gave them a research book and a note from Morgan to help them with their mission. Teddy and Kathleen told them they would be going to Antarctica! Since they really didn’t want Merlin to fall very quickly and disappear, they pointed to the research book and wished to go to Antarctica. On this mission they have a research book, a note, and the Wand of Dianthus. Soon Jack and Annie met a group of penguins. Soon something like a bird came and wanted to eat the penguins. Luckily, Jack and Annie protected them. Then they said goodbye to the penguins and left. They soon saw a group of scientists and reporters visiting Antarctica. They put on their goggles and masks and pretended to be one of the scientists and reporters. They also decided to pretend they were short grown ups so the bus driver and guide, Nancy, won’t freak out and have a heart attack about the fact that Jack and Annie were children. Since Nancy thought Jack and Annie were adult researchers she let them in the bus. Nancy talked about their training with a disease, to stay together, and that there were holes in the ice so watch out. She also talked about driving a snowmobile! Soon Nancy also wanted everyone to introduce themselves! What are Jack and Annie going to say? They can’t just say they are kids because then everybody will freak out, and Nancy will have a heart attack! This is not the only problem Jack and Annie have though, this is way too risky! Pretending to be a adult and researcher! They know none of the things the other researchers know! If Nancy figures out that they didn’t have any training including preventing the disease, she will freak out! Plus, she will have a heart attack when she figures out Jack and Annie are kids! Oh, and there are still the disease and the holes in the ice to worry about! What if they catch the disease? What if they fall in the holes in the ice? On top of all of that, how are they going to complete this mission quickly so Merlin doesn’t disappear? What are Jack and Annie going to do?