When Harry discovers that the most evil villain in the galaxy, Galactic Gary, has escaped from prison, it's not just humankind that is in danger, but time itself. Galactic Gary is trying to discover the whereabouts of a special time bomb that muddles the days of the week. Wednesday can become Saturday and Sunday can become Tuesday! The parts of the bomb are hidden on three different planets and the boys are in a rapid race to recover them. It's up to Harry and Colin to save the day (again!) in this action-packed, light-speed adventure.

This title is the fourth instalment in the 'Cosmic Colin' series.

Tim Collins (Author) Tim Collins is originally from Manchester, but now lives in London. He is the author of over thirty books including Wimpy Vampire, Cosmic Colin and Dorkius Maximus. His books have been translated into over twenty languages and he has won the Lincolnshire Young People's Book Award and Manchester Fiction City.John Bigwood (Author) John has worked as a designer at Buster Books for a number of years, designing covers and illustrating titles across a range of genres.