This is a book telling the true stories of three different "Jacks", The Spring-Heeled Jack, Jack the Ripper, and Pelorus Jack.The Spring-Heeled Jack was a fantastic character whose antics inspired many a "penny dreadful" novel. Never caught nor identified, his actions even today sound almost impossible.Jack the Ripper terrorized London for three months in 1888; a true to life monster whose savagery is still talked about today, then disappeared into thin air.Pelorus Jack wasn't a human at all - he was a dolphin who guided ships through the dangerous French Pass off of New Zealand. So admired by the people of that country that they protected him by law.