The screw keeps turning

Well, I thought something was going to be going wrong sooner or later, but I did not imagine that it would start at such a scale as how it did. First, a mysterious man appears at the mansion and the governess spots him. What is stranger at this moment is that, without a single word being shared between the two of them, the man suddenly disappears without a trace of his going anywhere. To give any character the benefit of the doubt, that man could have been a stalker, an unknown servant of the mansion, or maybe even a regular man who was just passing by the mansion. Any assumption of his identity could have been correct to any reader; that would be the case, however, until the governess finds the man again and he vanishes a second time. This time, she knows the man was there for a specific reason: to find the mansion owner's son, Miles. After a stimulating conversation between the governess and Mrs. Grose, the mansion's longest-serving servant, the shocking identity of the man is revealed. Now, I honestly did not know what to expect from this book before I started reading it and, therefore, did not think very much about the man at first, but to have it revealed that it may be the spirit of a homeless man who was a friend of Miles left me quite surprised. Along with that surprise came my realization that this was the first step for the governess to learn everything there was to know about the mansion's history and the children because when the truth starts to be revealed, the knots in the mystery start to untangle themselves. But as soon as Miles was starting to become a more open book to me, the story threw me a strange curveball when I less expected it. Not soon after the second incident with Quint (the man who was revealed as a possible ghost), another strange character, a woman this time, did the same thing as Quint: appeared out of nowhere, stayed for a small period of time, and the disappeared. As strange as that was, it wasn't as confusing as the discovery that the governess made about Flora, the mansion owner's daughter. According to the governess, Flora, however it may be possible, knew about the woman's presence and had no normal reaction to it, such as mentioning her to the governess. When will this confusion be settled and the truth revealed?