Disclaimer by Renee Knight. It sounded so promising, it delivered very little other than disbelief and a feeling of pissed-offness at the husband.
The Ice Twins by SK Tremayne. Again, promised a lot, delivered little, had a very important plot twist that just seemed so unrealistic that the rest of the book was a bit pointless.
The String Diaries by Stephen Lloyd Jones. It could have been better, I didn't realise it was just the first book, and the twist at the end annoyed me because they hadn't hinted at it at all, so it felt shoe-horned into the plot to justify a second book.
Second Life by SJ Watson. I liked the other book, this one didn't live up to expectations I felt.
The Girl In The Red Coat by Kate Hamer. It just wasn't what I was expecting and I didn't enjoy it.
How I Lost You by Jenny Blackhurst. Unrealistic plot and revelations, I really didn't like it, didn't believe it, lost all interest in it. It was just implausible from start to finish. I won't read one of hers again on purpose.
The Orphan Choir by Sophie Hannah. I've promised myself this is the last one of hers I will read, it was nonsensical and dull.