All aboard for murder

The Cape Farewell steams out to sea, carrying a serial strangler who says it with flowers and a little song. Behind, on a fogbound London dock, lies his latest lovely victim; and on board, working undercover to identify him before he strikes again, is Inspector Roderick Alleyn. But-with a collection of neurotic, bombastic, shifty, and passionate passengers at one another's throats-how long can he keep the investigation on course?