Series: Magic Tree House Merlin Mission
27 books
Book 1
Christmas in Camelot
Book 2
Haunted Castle on Hallows Eve
Book 3
Summer of the Sea Serpent
Book 4
Winter of the Ice Wizard
Book 5
Carnival at Candlelight
Book 6
Season of the Sandstorms
Book 7
Night of the New Magicians
Book 8
Blizzard of the Blue Moon
Book 9
Dragon of the Red Dawn
Book 10
Monday with a Mad Genius
Book 11
Dark Day in the Deep Sea
Book 12
Eve of the Emperor Penguin