According to Arnold

Meet Arnold Trevellyan - charismatic, exuberant and somewhat strange. His love of mushrooms is matched only by a passion for Flora, his wife of twelve years. One day, while searching for mushrooms, Arnold makes a wondrous discovery that will turn his world upside down. He abandons Flora and heads to the South Pacific where he finds himself marrying the queen of a remote tropical island. But all is not as it seems in Arnold's idyllic realm. In a series of cassettes to his oldest friend, he reveals he is trapped in an international conspiracy in which mushrooms hold the key to life or death.