Strange Invasion

What are Aquaterrans and Terraquans doing in England? Why can't Kitty, Sam, Toby, Lizzie, Luke, Jemima, and Jessica contact the Multiversal Research Centre? Why are coffee shops and toy shops being taken over by a mysterious new company? Investigating the company, Kitty's team find out who the joint owners are: two women who shouldn't be there on Earth at all. They'll have to stop them before even...