Heart must hide her beloved unicorn, Moonsilver, from Lord Dunraven's hunters. She and her animal friends join a troupe of traveling minstrels. Everyone thinks Moonsilver's horn is fake -- just part of the act. Then Moonsilver heals a badly injured boy right in front of the audience, and the unicorn's secret is in danger. Can Heart's mysterious silver bracelet, which makes her dream of the magical Mountains of the Moon, help her find the one place Moonsilver might be safe?