The Book of Lies starts with a bang - 15-year-old Cathy's confession that she murdered her best friend, Nicolette - and, for the most part, the rest of the book manages to match up to its explosive opening. It's consistently readable, totally compelling and ends on a chilling note. The narrative is split, alternating between two first-person stories which are both set wholly on the island of Guernsey. Cathy, writing in 1985, tells her tale in the form of a journal, recording the background of her 'friendship' - which is quickly revealed to have much darker hidden depths - with Nicolette, building to the climax of what really happened on the night of the latter's death. The other narrative - transcribed from a recorded monologue by Cathy's late father - belongs to Charlie, Cathy's uncle. He tells how he came to be involved with a gang of petty criminals during the Nazi occupation of Guernsey in the Second World War, ultimately resulting in the death of his father and Charlie's own ostracisation.
Both narratives are excellent, but Cathy's, which is dominant, is particularly striking. It's difficult to capture the voice of a teenager realistically, but Mary Horlock has pulled it off with Cathy, who is by turns incredibly sympathetic (her despair and lack of comprehension about why she has been singled out as the target of bullying by her supposed friends) and somewhat deranged (her escalating manipulative behaviour and the disturbing note of the ending). She's also hilariously funny - like a female version of Adrian Mole, she's intensely proud of her own intelligence and vocabulary, talks excitably at length about her crush on the rebellious Michael, and paints an amusing picture of the incestuous life of her local community, complete with daft nicknames and copious opinions. One bit in particular had me almost crying with laughter (in public). Quite apart from the issue of the murder, Cathy's narrative works wonderfully as a touching, funny and unique coming-of-age story. Incidentally, I've noticed this book has been tagged as 'young adult' by quite a few Goodreads users, but the fact that it has a teenage protagonist doesn't make it YA fiction. It's definitely an adult book, not necessarily in terms of the content, but in its subtle, complex characterisation, literary quality and carefully woven plot.
The narratives overlap and interlock in so many ways; Cathy's relationship with Nicolette is cleverly reflected in Charlie's narrative, as he finds himself increasingly in thrall to his dangerous friend Ray, and each new development for Cathy is mirrored by something that happens to Charlie. This being a portrait of life on a small, close-knit island, the reader also gets to discover family ties the characters themselves don't even know about. The wonderfully sinister ending is ambiguous, closing with Cathy's questions for her mother (another great twist on the teen-diary format, referring to the fact that many teenagers write while aware, consciously or otherwise, that their parents are reading their journals). We are left wondering: what did and didn't actually happen? Has Cathy known all along what her 'plan' would be? How do certain characters in Cathy's tale, who appear to have some resonance beyond their presence there, fit into the Charlie/Ray story? I have a feeling the answers to some of these questions are buried in there somewhere, and the book almost demands a second reading to figure out its puzzles. This is a fantastic debut, an engrossing and witty book which will appeal to anyone who likes twist-heavy mysteries, unreliable narrators and/or open-ended conclusions. Thoroughly recommended - and I'd put money on it being nominated for an award or two.