ALT Screenshot of an Amazon review which reads: I LOVED this book and have immediately bought a copy for my ten year old nephew. It starts with time fugitive Astra crash-landing in 12yo Sam's school with a space octopus. And turns into a thrilling ride as they travel in a time machine through worlds and space with Sam hoping to bring back his dead brother. But changing things in the past can cause ripples with far-reaching consequences, and the Time Police and Silent Angels are hot on their tails. Full of unexpected and exhilarating twists and turns and bursting with heart .

ALT Two book covers - left: Ghosts of Mars which shows a red-haired astronaut standing inside a space station with ghosts outside the window, a dust storm brewing and a snake about to attack. Right: shows the same astronaut with her helmet on and back to the viewer, with a small android companion, standing on the surface of Ceres, facing an alien creature and a cryovolcano.