Ken Grimwood (1944–2003) worked in broadcast journalism for a number of years before retiring in 1988 to write full-time. He wrote five novels, including the award-winning Replay, Breakthrough, and The Voice Outside.
First half pretty decent. Similar to Into the Deep with the multiple storylines converging. Second half seems like a different story. Maybe Grimwood stepped away for a while and decided to turn the story in a different direction. I did not like part two and found it difficult to push myself to finish. I'd recommend Replay and Into the Deep as Grimwood's better books