Very disappointing and not credible

After reading the first book I've eaten, I was eager to immerse myself in Josephine adventures and find the fluid and pleasant style of the author.
The beginning does not start too badly, we find all the characters that were so appreciated.
Throughout the pages, events become less and less credible and the last part is in my opinion downright zero.
I will not go into detail so as not to reveal the end to those who have not read the novel but:
- The detective story is poorly conducted and arrives a bit like a hair in the soup (a novel that turns suddenly detective novel in its second part, it is not credible)
- The end Iris is ridiculous and not credible (how such a strong character can in twenty pages without a lot of psychological descriptions, change so much?)
- It remains on its end for some characters like Gary and Hortense or Marcel and Josiane ...
In short, a great impression that the novel has either not been worked on its second part, whether Pancol changed being written course or that the novel was completed in haste ...
In one word: disappointment.