The Maltese Parrot : a Patricia Fisher mystery

When she finds a wounded member of British Intelligence in her bedroom, Patricia really isn't that surprised. I mean, it happens all the time, doesn't it? However, she is surprised, and really not delighted, to hear that he has a secret task for her. Find his contact, hand over a harmless looking data storage device that just happens to have the details of a superweapon on it and save the world from certain disaster. Her country needs her. Wel...