Trading the Teind - Geither Regina M.

Dangerous Fairies. 
A Magical Snow Globe. 
Discover the Adventures of the Celtic Kids. 
 
The O'Brien twins are caught in the middle of another fairy adventure. Every seven years, the fairy teind must be paid to the king of the Fairies, Oberon. Only this time, Caitlin is the teind. Sean and his companions battle evil shape-shifters, giant spiders, a three-headed guard dog, and a pair of sorcerers to rescue Caitlin. Will the Fay Seekers be able to escape the greedy overlord? Or will they be forced to pay the teind?