Based on the book by Terry Pratchett, the adventure begins for thirteen-year-old Johnny Maxwell and his four friends when they come to the aid of eccentric homeless woman, Mrs Tachyon, and are left minding her trolley full of black bags while she is hospitalised. When the children later visit her in hospital, Mrs Tachyon lets them into the secret that her black bags-- or 'Bags of Time-- are special and can be used to create a gateway to the past. The five youngsters end up during the Blitz where fun and games turn serious when they quickly realise the prejudices of the era. But when they return to their own time, the gang discover they have somehow changed history as a result Johnny's grandmother died in a bombing as a teenage girl meaning Johnny's mother and, in turn, himself were never born. The children are now in a race to fix the path in order to save the future but can they succeed before the bombs start falling...? Written by Melissa J

Johnny Maxwell and his friends discover that the shopping cart that a local bag lady pushes around is in fact a time machine. But when they travel to 1941 they accidentally change history and Johnny's grandmother is killed by a German bomb before she even marries his grandfather. Written by Anonymous

Johnny Maxwell stumbles upon a time machine when he helps an old woman, but little does he know that his journeys back to 1941 cause a chain of events which alter history. Johnny and his friends must go back in time to reverse the changes and save his own existence. Written by Andrew McDonald

The injured Mrs. Tachyon, a bag lady, goes to hospital and leaves Johnny a mysterious shopping trolley. When he and his friends investigate the contents they are transported back to the second world war on the day their small town was bombed. Written by Mark Smith