This Is How You Loose the Time War
Amal El-Mohtar and Max Gladstone

A wonderful little book imagining a fight / friendship / love affair (?) between two warriors in a war across time. Written by two top notch SF writers it consists essentially of letters our warriors write to each other across time. The whole thing is just so well done. Places visited are both real (the Mongol horde) and imagine (future possibilities) and across them our warriors begin a relationship where it is never really clear exactly what is happening here. Is this love, or a trap?

Incredibly clever, very well written, this was just a joy.

Recommended.