The Famous Five (1978)

S2E12 Five Go Down to the Sea (1)

Who would intentionally entice someone onto the perilous rocks along the Cornish coast? Mysteriously, lights are being signaled from the old tower during stormy nights, raising alarms for the Famous Five. Sensing imminent danger, the group is determined to unravel the mystery, but will they be able to do so without putting themselves at risk?