Try this one...
A swagman has decided to steal the crown jewels of England just before Parliament
sells them. As the world the swagman plans to rob is an echo, such a theft might disturb the echo's history. Meanwhile, agents from both Homeline's Britain and the Cabal are in London trying to buy some or all of the jewels. The Cabalists are realy excited about Elizabeth Tudor's "Unicorn Horn." Everyone used to think it was just a
Narwhal's tusk (those regularly wash up in Wales) but now Homeline wants a closer look.