In a land defined by war, Mika and Tarv are Inkbound, tied to each other through magical tattoos that allow them to communicate over distances to pass tactical information from legion to legion. The bond creates other side effects, as well -- effects the generals would rather ignore.
When Tarv's legion is attacked, his bond to Mika disappears. Mika is left alone, with no idea what his future might hold -- for when one Inkbound man dies, often the other one does too.