PAVILION, SELSEY. A FIRST-CLASS mystery story comes to the screen of the Pavilion, Selsey, for the first part of next week, when the attraction is "THE DARK MAN," starring Maxwell Reed, Edward Underdown, Natasha Parry, William Hartnell and Barbara Murray. The story starts with a double murder by the Dark Man, and an appeal for information brings Molly, an attractive young repertory actress under police protection when newspapers say she can identify the killer. The Dark Man, however, gets his chance, and Molly is attacked and left for dead. She recovers to give important information, and there are plenty of thrills as the killer is tracked down. The acting makes this one of the best of recent British thrillers. The accent is again on police investigation in the film for the remainder of the week. "THE CLOUDED YELLOW," starring Jean Simmons, Trevor Howard, Sonia Dresdel with Barry Jones, Kenneth More, Geoffrey Keen and Andre Morell, tells how suspicion falls on a young girl when a man is found dead near the country house where she lives. A Secret Service agent living in the village is not so certain as the police, who believe they have a clear case against the young girl. His investigations provide some absorbing entertainment.