After her terrifying experience at the hands of the Watchers, Mina has escaped to a cottage on the west coast of Ireland. She obsessively researches the Watchers, desperate to find any way to prolong the safety of humankind. When Mina encounters a stranger near her home, she fears the worst, for she knows the figure is not what it seems. She soon discovers her elderly landlords have disappeared. But someone, something is inhabiting their home. Fleeing for her life, Mina finds clues to the Watchers’ presence at every turn. Their power is growing but when Mina reports her fears to the police, she finds her sanity questioned. Mina must convince staff at the psychiatric hospital where she is taken that her stories of malevolent beings are not fantasy but fact but that will soon be the least of her troubles.