'This is for you,' Laura's grandmother says, and so begin Laura's adventures as the Zecrof Guardian, protector of the Zecrof locket, with the power to travel into the past. With her uncle David, cousin Steve, brother Bob and sister Mandy, fourteen-year-old Laura's first journey takes her into AD 845, where no coastal village is safe from the Viking raiders that threaten England's shores. Laura and her companions are swiftly drawn into the battle against these marauders. But Laura has her own threat to worry about: Upsilon, who will stop at nothing to undermine the Zecrof Guardian with his...

What on earth are aliens from Mars doing in a farmer's yard in the year 1942? Fourteen-year-old Laura is the Zecrof Guardian, able to travel into the past, and it is up to her to find out. A simple trip back to 1942 with her cousin, Steve, and best friend, Alice, becomes anything but simple when Laura finds herself with the sole responsibility of saving Earth from an alien invasion! However, Laura's darkest adventure is yet to come. When she and her companions are plunged into the middle of the Civil War in 1644, she will soon experience the terrible consequences of evil wraith Upsilon's...