Novel for teenage girl about london or Claridge's Hotel

Hi. We are taking our teenage grand daughter to London in April and staying at Claridge’s Hotel. I am looking for a suitable novel to suggest she read before we go about London or that takes place at Claridge’s. Any suggestions? Is there an Agatha Christie novel? Thank you.

Re Claridges specifically, I would call the hotel as they should know better than anyone. Re London more generally, my almost teenage daughter recommended:

  • The London Eye Mystery by Siobhan Dowd
  • the Geek Girl series of books by Holly Smalle