He’s a brilliant inventor, but he’ll decimate anyone who threatens his woman.

When the Kings of the Castle recommend Calvin Atwood, strategic defense inventor, to create a security shield for the kingdom of Durabia, it's the opportunity of a lifetime. The only problem—it’s a two-year assignment and he promised his fiancée they would step away from their dangerous lifestyle and start a family.

Security specialist, Mia Jakob, adores Calvin with all her heart, but his last assignment put both of their lives at risk. She understands how important this new role is to the man she loves, but the thought that he may be avoiding commitment does cross her mind.

Calvin was sure he’d made the best decision for his and Mia’s future, until enemies of the state target his invention and his woman. Set on a collision course with hidden foes, this Knight will need the help of the Kings to save both his Queen and the Kingdom of Durabia.