Dark Twilight. Dark Journeys Series

Dr. Harper Paget returns to China with the ashes of a lady-friend who died in the USA and resumes teaching in universities as he did before. He meets new friends and new students, including Dr. Brady Simon, a media professor from Canada. He also encounters Christabel, an unusual lady who gave him up for a French colleague before but who wants to keep in contact with him. In fact, she does visit him once in his campus apartment.
SMSs turn out to be not only a method for Harper to communicate with Christabel or with his new love interest, Anjani; Brady also communicates with women in the Philippines who tell him about a creature called an Aswak. Harper knows that the Kuntilanak from Indonesia haunted China before and can certainly do so again. An SMS, for one thing, can produce more deadly results than before. This time he is attacked by a Kuntilanak in the dark, but he still does not know who she is.
She may be Xue, a Chinese lady who works in the Foreign Affairs Office but who disappears from the campus. She may be Marilyn, a student from a former university who wants to visit him here, She may even be Anjani, his Indonesian love interest who tells him stories about human tragedies in her own country. Across the courtyard from his dorm building is a tall dorm building for female students. At night, from his wheelchair, he watches them and they watch him.
Are they a formidable threat or not?. Who is it? You are the target, Harper. You had better find out the real identity of the creature or you will soon be dead.