One of a set of three, each book can be read as a stand alone novel or as part of the 'Johnny Trilogy', (although younger readers may not fully appreciate the 'space invader' references in 'Only you can save mankind'). Full of quirky humour and suitable for equally quirky 9ish year olds and up. Johnny Maxwell and his friends become unstuck in time and end up in 1941 Britain. One of them is separated from the rest and as a result creates a 'new trouser leg of time', resulting in a moral dilemma in the future, or is it the present? This book has a back story, a front story and a feasible explanation for eccentric bag ladies everywhere, (and their cats). My favourite book of the trilogy, where the characters of this series of books are fleshed out. Useful to upper juniors studying the differences between world war II Britain and the present day, in a relaxed kind of way. File under science fiction though.