Teenager Jake breaks into a fenced-off old quarry, meets a mysterious girl, and gets into trouble. His story is interleaved with that of a neolithic stone cutter and a quarry man in 1939. Each of their lives is affected by a strange black monolith which has the power to bridge across time.
The writing is good, highly readable and well edited. Switching between the different plot threads is handled well, maintaining tension and interest. My only reason for not recommending this one is that the whole book feels like set up for the real story (a sequel is planned). It’s all enjoyable, but not a great deal happens.