Bill Peters was a world-renowned guard in a community who train all their lives to protect vulnerable figures in society. When he dies, he leaves his 13-year-old daughter May and her mother, Ann, with targets on their backs. When it is made clear to both women that they aren’t safe if they are together, precautions are taken.

Five years on, a newly 18-year-old May is sunning herself at her grandparents’ house in Cornwall, having recently been expelled from the high-security training academy that had been her home. The beautiful Tristan Knight sits in silent shock as his mentor, Bryan Malus, describes the events that led to May’s expulsion, assigning her as Tristan’s first client after his graduation. Tristan begrudgingly goes to Cornwall to guard May, whom he hasn’t seen in five years, and sparks fly.

When the duo returns from town, their bickering is cut short as they take in the sight of the man lying dead on the front porch. Tristan and May try to outrun the men chasing them while simultaneously trying to decipher the message Bill Peters left for only his daughter to find. As Tristan and May grow impossibly closer, secrets are revealed, and trust is put to the ultimate test.