The Secret of Moonacre 2: The Shrouding Darkness

All seemed well after Maria saved Moonacre Valley. She's been gone for three years to finish her schooling and finally she's returned home. But the very first night she is there, terrible nightmares assault her and something feels off. Darkness has been taking over Moonacre Valley and it is up to Maria and Robin to discover what is threatening them and stop it before everything is lost. And what about Robin? He's certainly been acting strange lately. Why is he seeming so gentle towards her when he so rough and wild for the rest of the world?
(Better than description I promise)