Magic Tree House Books 21-24 Boxed Set : Paperback : Random House USA Inc : 9780385389570 : 0385389574 : 25 Jul 2018 : Morgan le Fay, the magical librarian, reveals that Camelot is in trouble! She asks Jack and Annie to find four different kinds of writing that will help. Their quest leads them through American history. This set includes \"Civil War on Sunday, Revolutionary War on Wednesday, Twister on Tuesday, \" and \"Earthquake in the Early Morning.\" Illustrations.