The kidnapping victim locks his hotel room door as he enters it, but the room service waiter opens the door without a key.
There was no reason for Monika Vidal to introduce herself to Jessica as a reporter and ask for an interview on two different occasions. Especially knowing that Jessica and Nigel were friends and may ask questions.
Jessica always calls her British Intelligence friend, Michael Hagarty, whenever she has anything to do with Scotland Yard, and it is not explained why she does not this time.