I have finished ‘book 1’ and I’m onto the 2nd book now. The 2 authors thing is seamless. The first twist took me totally by surprise, I was caught out making assumptions and was I wrong. There is an all pervading menace to the book which has definitely increased now I am half-way in.
I am reminded of genre which includes The Girl on the Train and Sleeping with the Enemy – nothing is as it seems and some characters seem toxic.