Part of a new series for young children which examines different machines, these books take a day in the life of format. Through simple text and colourful drawings, they show how each machine is used. This book is about a tugboat. Other titles in this series include The Story of a Jumbo Jet,The Story of a Helicopter, The Story of a Digger, The Story of a Truck and The Story of a Tractor. Angela Royston is also author of the Animal Life Stories and Farm Animal Stories series.