In reading order
Merlin Mission Collection
Mary Pope Osborne
Christmas in Camelot
Mary Pope Osborne
Haunted Castle on Hallows Eve
Mary Pope Osborne
Summer of the Sea Serpent
Mary Pope Osborne
Winter of the Ice Wizard
Mary Pope Osborne
Carnival at Candlelight
Mary Pope Osborne
Season of the Sandstorms
Mary Pope Osborne
Night of the New Magicians
Mary Pope Osborne
Blizzard of the Blue Moon
Mary Pope Osborne
Merlin Missions Collection: Books 9-16
Mary Pope Osborne
Dragon of the Red Dawn
Mary Pope Osborne
Monday with a Mad Genius
Mary Pope Osborne
Dark Day in the Deep Sea
Mary Pope Osborne
Eve of the Emperor Penguin
Mary Pope Osborne
Moonlight on the Magic Flute
Mary Pope Osborne
A Good Night for Ghosts
Mary Pope Osborne
Leprechaun in Late Winter
Mary Pope Osborne
A Ghost Tale for Christmas Time
Mary Pope Osborne
Merlin Missions Collection: Books 17-24
Mary Pope Osborne
A Crazy Day with Cobras
Mary Pope Osborne
Dogs in the Dead of Night
Mary Pope Osborne
Abe Lincoln at Last!
Mary Pope Osborne
A Perfect Time for Pandas
Mary Pope Osborne
Stallion by Starlight
Mary Pope Osborne
Hurry Up, Houdini!
Mary Pope Osborne
High Time for Heroes
Mary Pope Osborne
Soccer on Sunday
Mary Pope Osborne
Shadow of the Shark
Mary Pope Osborne
Balto of the Blue Dawn
Mary Pope Osborne
Night of the Ninth Dragon
Mary Pope Osborne