Tom Pollock‘s YA thriller (released in the US as THIS STORY IS A LIE) is a twisting, fascinating affair that incorporates both espionage and speculative elements and a serious and sympathetic look at what it‘s like to have mental health issues to great and moving effect while conveying a love for the complexities of mathematics but, for me, there was one twist too many in the final quarter and the open ending left me a little frustrated.