Winter is nearly over and Heart is glad - but she is also afraid. Will Tin Blackaby's men start searching for her again? How long will it be before they find her? Ruth Oakes, Ash Grove's healer and her only friend, is the only one who knows where Heart is hiding - and what she is hiding - the unicorns - Avamir and Moonsilver. Heart knows that she can't hide in her cave forever. But where can she go? Where will the unicorns be safe? Should she head towards the mountains that haunt her dreams, white and grey, the colours of the moon? Instinctively Heart knows that they will be safe there. But the mountains are guarded by Lord Dunraven's men. It will take a miracle to get there - but an even bigger miracle awaits Heart and the unicorns in the Moutains of the Moon.