Haunted Castle on Hallows Eve (Magic Tree House: Merlin Missions #2)

Mary Pope Osborne is the award-winning author of many distinguished books for children and young adults, including the bestselling Magic Treehouse series; Favorite Medieval Tales, illustrated by Troy Howell; American Tall Tales, illustrated by Michael McCurdy; Rocking Horse Christmas, illustrated by Ned Bittinger; and Adaline Falling Star. The former president of the Author's Guild, she lives in New York City with her husband, Will.

Giselle Potter has illustrated many books, including Try It! by Mara Rockliff, All by Himself? by Elana K. Arnold, and Kate and the Beanstalk by Mary Pope Osborne, as well as her own Tell Me What to Dream About, This Is My Dollhouse, and The Year I Didn't Go to School, about traveling through Italy with her parents' puppet troupe when she was eight. She lives in Rosendale, New York, with her husband and two daughters. Visit her at GisellePotter.com.