The cover illustration has a bright font for the title, and a darker background of a girl walking. It draws you in, with its mystery and simplicity. This will look good on a shelf, and easily found as it stand out.
The writing structure is good, broken up for easier reading, occasionally with a couple of excerpts from something relevant within the story, although this is clearly labelled, and recognisable. At times the writing seems chaotic, this seems to put across the ADHD mind, and it is described in an incredible way. It is rare that I read a story that really gets mental health properly, Joss has done it well. For comparison, "The Girl with the Dragon Tattoo" - has put across autism in a terrible way, having studied about it, and living with someone who is autistic (And ADHD for that matter), I was entirely disgusted with that book.
"Don't Trust Me" heavily focuses on the investigation, being a crime/thriller. I found the scenes in the story involving this, were done in such a way that it was believable, and relatable. I found myself struggling to work out who the culprit was, right the way through I had suspected each character at least once. As I have said previously, the chaotic mind of ADHD is reflected in the book extremely well, going off on tangents occasionally to emphasise this.
As for most likable character, I would personally say Jessica, she's the most relatable to me. The chaotic lifestyle, job, and past, there is something for everyone to empathise with at some point in their adult life.
This is Joss's first venture into the Adult Crime genre, before she has written a lot of YA Fiction, fantasy and dystopian worlds being a favourite. I have read her Savant series (Finding Sky, Stealing Phoenix, etc), Struck (Raven Stone series), Peril & Glow. In "Don't Trust Me" I saw a different writing style, aimed at a more adult audience, with adult themes and experiences (done tastefully).
The book flows well, capturing me at every turn, always something keeping interest. I struggled to put the book down, as is evident from when I started to when I finished reading it.
I highly recommend this book, it is well written and captivating, it keeps you guessing at every turn. I could envisage everything in my head, which is always a good sign of a good book. I definitely think Joss should continue writing more adult fiction, as she has done so well. I had shivers up my spine once I had finished!
I have given 5 stars because I truly couldn't put it down, the story flowed well, and was very relatable. I loved it.