Watch Online Free on Watchseries. Lucy and David are a young couple looking to get a foot on the slippery rungs of the London housing ladder. Lucy is six-months pregnant, making the whole situation even more stressful. Visiting a potential flat one evening, they are disturbed by the unsettling behaviour of the Estate Agent. He seems determined not to let them leave. Soon they realise why. Someone...or something...else is already living there.