In Nicolas Roeg's adaptation of Roald Dahl's novel , a young boy is vacationing at the seaside with his grandmother when he discovers that the hotel he is staying at is hosting a convention of witches. Eavesdropping on the witches, he learns that the Grand High Witch (Anjelica Huston) has devised a plan to turn all of the children in England into mice. With creature-effects by Jim Henson's Creature Shop, was the last film Henson worked on before passing away in 1990.