Standoff (Cascadia Wolves, #4)

Cade Warden has always put his Pack first, setting aside everything else - even his need for a mate. Now Warren Pellini has a new biological weapon, threatening everything Cade holds dear. Into his life walks Grace Pellini, sister of his greatest enemyand his destined mate. Grace walks a dangerous line, gathering information to aid the Nationally Allied Packs. In the midst of their rising passion and desperate search for the key to disabling the weapon, Pellini raises the stakes with a Challenge. Grace must stand by, Cades life in her hands, as her mate risks everything for his people.