The Knickerbocker Gang: The Talking Grave (1995)

Get set for the adventure of a lifetime when a "dare" leads four curious kids into a hair-raising investigation. While four friends meet at an old cemetery, they stumble over the grave of a famous magician. Things soon turn spooky as they're haunted by a cloaked stranger and mysterious voices begin erupting from the magician's grave. When they discover a magnificent stolen diamond, the "Snoopers" embark on a wild chase with non-stop surprises in this fun tale that the whole family will enjoy.