this sounds like an amazing thriller with so many different options to take, as far as guessing who it may be. all the characters seem to be quite different but fit similar generic tropes in a thriller book. i’ve only read an extract from it but i can tell by the writing style that this took time to craft and write as there doesn’t seem to be any plot holes as far as i can tell. the children seem to be quite oblivious and the parents are there just to enjoy the holiday. as far as figuring it out, it is never the person they try and make you believe it is, there is always a huge plot twist revealed that will change someone’s perspective of the book. personally, i think it would be quite a fun and easy read as it doesn’t seem as if it would be too heavy, but it’s not the best book in the entire world compared to other thrillers out there. overall i thoroughly enjoyed it.