Sophie and her friends can't believe it when, on a school trip to Russia, they find themselves on the wrong train. Thrown out in the snow at a deserted station, they're rescued by the beautiful and mysterious Princess Anna Volkonskaya, who takes them to her winter palace. At first, the girls are mesmerised by her stories of white wolves and lost diamonds, but when the princess takes a special interest in Sophie, the girls begin to feel afraid...

A thrilling and beautiful new novel from the best-selling author of The Wolf Princess.Marina's father, a naval captain, has been away for most of her life - certainly since her mother died - and yet Marina feels the pull of an ocean she's never known. When sent to boarding school to learn to be a lady, Marina decides instead to stow away on her father's ship. A perilous voyage awaits - but where are they sailing to and why, and what has it to do with the dark shape in the deep that...