Twin siblings Blake and Emily love tromping through the woods, hiking and exploring. But only Blake believes in magic and the Fair Folk until he and Emily accidentally enter a fairy portal and Emily carves their initials on the pathway through: a giant, old white oak. A fairy curse falls down on their heads and they seek help from their grandmother, Florence, and her friends, two resident cottage witches, Clementine and Dix. When Clementine and Dix give Blake and Emily the Fairy Sight, not only do they finally get to meet their source of ill fortune (a tiny, grumpy woodland fairy named Tassie), they have to make a deal with her to repay the woods for what Emily has damaged. Meanwhile, there's this beautiful Merrow boy who keeps following Blake from lake to river to stream...