I hard a very hard time finishing This Is How You Lose the Time War, by Amal El-Mohtar and Max Gladstone. It is a set of letters between two time travelers from the future. They are semi-omniscient (they can inscribe letters in cells of berries that the person receiving the letter will eat, in the past? etc.). That part of time travel is not really dealt with at all. There is almost no description of the post-future societies. These strange creatures, however, long to be middling poets from the 19th century (i.e., Bob Dylan?). Their prose I found excruciating. Midway through the novel they decide they are in love with each other. The prose gets more maudlin. Ugh!