My Secret Unicorn: Stronger Than Magic

Lauren and Twilight are very busy using magic to help Lauren''s school friends sort out their problems. But one day Twilight falls sick with a mysterious illness. Lauren is desperately worried but the vet can find nothing wrong. Soon Lauren realises that it must be something to do with Twilight in his unicorn-form, and she discovers that using his magic for trivial deeds has been sapping all of ...