Night of the Red Horse (Jinny, #4)

"Suddenly red light flashed over the metal sky, and above the rim of the marsh came the Red Horse. It stood braced for a moment, its head turning arrogantly as it surveyed the black landscape through its yellow eyes."
Something strange is happening at Finmory. Jinny is being plagued by nightmares and visions of the sinister Red Horse from the mural in her room. What does it want, and why won't it leave her alone? Jinny must delve deep into the past and the Celtic legends of the Pony Folk in her terrifying quest to find peace.