Trick or Treat?: A spooky Halloween picture book with a twist!

Prepare for a spectacular twist in this bewitching tale!
A witch can't believe her luck when a little girl knocks at her door playing 'Trick or Treat'. It just so happens that 'little girl' is the ingredient she's missing from her potion.
The little girl compliments the witch on her 'costume'. The witch goes along with the idea that she is just pretending to be a witch for Halloween and thinks she has tricked the little girl into getting into her cauldron.
But it turns out that it is the witch who in is for a surprise. As the cauldron fills with fog, the 'little girl' reveals she has a TRICK in store for the witch in this sparklingly original Halloween TREAT!