Summer of the Sea Serpent (Magic Tree House #31)

Jack and Annie are off on another mythical mission at the request of Merlin the magician. Luckily, they have a young sorcerer, Teddy, to help them. From underwater caves to a Spider Queen, from mystical selkies to a magical sword, this is a Magic Tree House adventure kids won't want to miss.
ASIN: B00L87ZWH0
VSKU: RDV.B00L87ZWH0.A
Condition: Acceptable
Author/Artist:Osborne, Mary Pope
Binding: Paperback