The Price by Roland Thorne (#6)

Unsurprisingly, Seville was a trap. The Persuader was surprised, disabled, and boarded by a devastatingly powerful battlecruiser called the XM50. On Seville, the well-connected Lucia has finally agreed to help Pavel with a bid to free her system from the lies of Salvador.

The enemy brings their own personal fleet to escalate, forcing Vanguard to lead them away into a vicious hide-and-seek warship battle between the mountain peaks near the capital city.