Sequel to The First Casualty. Serious spoilers ahead for that.
After the war, Izzy got her own ship. It's junk. But she's sent out after pirates, and does take one out. She goes on to an agricultural planet -- where some of her people vanish on shore leave, and some of the locals are vanishing too. It gets complicated from there.
It involves setting three fires, raising drugs, smuggling a message out, widows ensuring that no prisoners are taken, color-coordinated devices, refitting a ship, a planet's marriage customs, and more.