When signalman "Bert" (Robert Newton) sees some suspicious activity in the harbour one night he investigates only to find a corpse and a suitcase. On returning to his box to call the authorities, he notices that the case contains rather a large quantity of banknotes. Around £5,000! Now he is single-handedly trying to raise his daughter "Betty" (Margaret Barton) and has a few other issues to contend with, so he decides to keep the windfall and keep his head down. That might have seemed a good plan at the time, but soon people begin to spot the signs of his new found wealth and with police from b...