It's action all the way in this classic and witty whodunit centred round the fate of the 19th-century Round House could wreck the multi-million pound development in a south coast resort. A dozen interested parties are in favour of knocking it down. They include an Arab oil sheikh, a sexy English Literature drop-out from Sussex University, the head of a construction company, and a romantic novelist. And where does Canon Tring's languorous young wife fit in to all this?

Only Louella, Lady Brasset, is committed to keeping the Round House standing; she believes it to be the joint creation of two famous architects, Sir John Soane and William Butterfield. But four hours after Treasure promises her a stay of execution on the house, it's Louella who is blown up-and another accident follows. Double accident-or double murder?