<Tr> <Td> </Td> <Td> Mummies in the Morning (UK title: Secret of the Pyramid) </Td> <Td> 000000001993 - 08 - 24 - 0000 August 24, 1993 </Td> <Td> In the mystery of the Tree house #3 </Td> <Td> In Ancient Egypt, Jack and Annie help Queen Hutepi find her missing Book of the Dead . Companion book: #3, Mummies and Pyramids . </Td> </Tr> <Tr> <Td> </Td> <Td> Pirates Past Noon (UK title: Pirates' Treasure!) </Td> <Td> 000000001994 - 03 - 08 - 0000 March 8, 1994 </Td> <Td> In the mystery of the Tree house #4 </Td> <Td> Jack and Annie encounter some pirates in the Caribbean Sea and meet Morgan le Fay, who turns out to be the mysterious "M". Companion book: #4, Pirates . </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Night of the Ninjas </Td> <Td> 000000001995 - 03 - 21 - 0000 March 21, 1995 </Td> <Td> In the mystery of the Magic spell #1 </Td> <Td> Morgan le Fay is under a spell . Jack and Annie must find four magical objects to reverse the spell, with the help of a mouse named Peanut . In ancient Japan, Jack and Annie encounter ninjas and samurai and get a moonstone . Companion book: #30, Ninjas and Samurai . </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Afternoon on the Amazon (UK title: Adventure on the Amazon) </Td> <Td> 000000001995 - 08 - 29 - 0000 August 29, 1995 </Td> <Td> In the mystery of the Magic spell #2 </Td> <Td> Jack and Annie search the Amazon rainforest for a second magical object for Morgan le Fay, which turns out to be a mango . Companion book: #5, Rain Forests . </Td> </Tr>

How many magic treehouse books are in the series