Mercy Watson to the Rescue by Kate DiCamillo
"To Mr. and Mrs. Watson, Mercy is not just a pig — she's a porcine wonder. And to the portly and good-natured Mercy, the Watsons are an excellent source of buttered toast, not to mention that buttery-toasty feeling she gets when she snuggles into bed with them. This is not, however, so good for the Watsons' bed. BOOM! CRACK! As the bed and its occupants slowly sink through the floor, Mercy escapes in a flash — "to alert the fire department," her owners assure themselves. But could Mercy possibly have another emergency in mind — like a sudden craving for their neighbors' sugar cookies?"—Summary
Miss Daisy is Crazy (My Weird School #1) by Dan Gutman
"Something weird is going on. Miss Daisy, who teaches second grade, doesn't know how to add or subtract. Not only that, she doesn’t know how to read or write either. She is the dumbest teacher in the history of the world!"—Summary
World at War, 1944 (Magic Tree House Super Edition #1) by Mary Pope Osborne
"When the magic tree house takes Jack and Annie back to World War II, Europe is in trouble! It is June 1944 and the brother-and-sister team must go behind enemy lines and crack a code that could save a lot of lives. But this is war, and Jack and Annie might just be in the wrong place at the wrong time. Can they save everyone before the great battle of D-Day begins? They don't know, but they have to try!"—Summary
Previously published in hardcover as Magic Tree House Super Edition #1- Danger in the Darkest Hour.