Time travel book. The 1st half has much more going on than necessary. But when Caesar arrives in the 1990s LA science lab it really takes off - what with bad guys chasing him (and Cassandra, linguist and reformed escort) from LA to Vegas and back. I liked it enough to forgive that it's a 13 hour audiobook that should have been 8 and had a few plot holes. A good editor could have made this great.
Full review: https://bit.ly/rvw-Coin