By Karen Bryans & Sanjeeta Bains What do you get if you take a game of crusty old Cluedo and relocate it to a lush and sun-soaked Caribbean isle? No more murder in the library with a candlestick by Professor Plum, that’s for sure… try drowned in a fishtank, electrocuted in a swimming pool or poisoned with a puffer fish. It’sDeath in Paradise. Murder most fanciful, and fun. And it’s back with a belter on Sunday, the 100th episode. Ralf Little, who plays DI Neville Parker, is pinching himself. “For me to have been here and be lucky enough to lead a stellar cast and be trusted with this legacy is…