The set-up - Liz Allen

Number One disappears after a night out with her girlfriends. She was young, successful and beautiful.

Number Two disappears after working late at the office. She was young, successful and beautiful.

Number Three disappears after a business trip to New York. She was young, successful and beautiful.

The Dublin police are baffled, and call in Kate Waters, crime profiler, to give them a lead. Kate welcomes the job, but she has a history with the lead detective on the case, Timmy Vaughan, and they both fight to keep things on a firmly professional footing. As the investigation progresses, Kate and Vaughan realise they are dealing with some of Dublin's most vicious criminals - and that they seem to have an informer within their own ranks.