A seemingly idyllic English holiday park turns into the scene of a grisly murder and a perplexing case for Lambert & Hook Twin Lakes is a tranquil place. It is a complex of holiday homes in a particularly beautiful part of England. 'Rest Assured', says the sign at its entrance. And the people fortunate to occupy the luxury homes on the site are indeed able to relax in a beautiful setting. Then a series of mysterious threatening notes are delivered...