The Resolution - Toby Marks

As you all know in 7/8T we are up to the final few chapters of the curious incident of the dog in the nighttime. I find the plot is changing quite frequently starting as, who killed Wellington? Then to who killed mother? After what happened to Mother? And now Christopher is on an adventure through London nearly getting run over by the underground for his rat Toby. For some reason I thought that the woman with the guitar was his mum. I have a sort of gut feeling that he is going to run into his dad because he hasn't been in the story for a while and I am suspicious that he is following him.