<Tr> <Th> No. of books </Th> <Td> 8 </Td> </Tr> <Tr> <Th> Website </Th> <Td> Official website </Td> </Tr> <P> The Missing is a series of fictional young - adult novels written by Margaret Peterson Haddix . It tells the story of famous children from history stolen by futuristic time travelers from their place in time and accidentally sent to the 21st century as babies . They are then adopted by families in the 21st century . Because Jonah is one of the stolen children, he, along with his non-adopted sister Katherine, must help return the missing kids to their rightful places in history and fix time before it is destroyed . The first book in the series, Found, was published on April 22, 2008 . The series continued with book titles Sent, Sabotaged, Torn, Caught, Risked (originally intended to be titled Kept), and Revealed . The eighth and final book, Redeemed, was released on September 8, 2015 . There are also two ebook short stories, Sought (which takes place before Risked) and Rescued (which takes place between Risked and Revealed). Haddix originally intended the series to consist of only seven books, however, she stated that she had trouble closing out the series in seven books; leading to her decision to write Redeemed . </P> <P> A thirteen - year - old boy named Jonah had always known that he was adopted and had never thought much of it until he began receiving strange letters sent to his house . When Jonah's friend Chip, who received the same letters, learns that he is also adopted, Jonah, Chip and Jonah's sister, Katherine, set out to find out the truth about their origins . They end up in the middle of FBI investigation, people appearing and disappearing, and a strange tale from a woman named Angela DuPre, who saw a plane appear (and later disappear) from nowhere, and discovered 36 babies on board, minus pilot and copilot . The three come to realize that Jonah and Chip are important missing children from history who were transported to the 21st century by baby smuggling time travelers, whose names are Gary and Hodge . Later, they are unknowingly lured into a cave, known as a time hollow, with all but one of the other 36 missing children in an attempt by the smugglers to take them to the future . After they have defeated the smugglers, another time traveler from the future known to them as JB (Janitor Boy) decides to send Chip and another boy, Alex, back to the 1480s, where they were originally taken from . While trying to stop him, Jonah and Katherine are accidentally taken along for the trip as well, leaving it up to them to save their friends and return to the 21st century . This sets the plot and the title for the following book in the series, "Sent". </P>

How many books are in the missing series by haddix