Defense Breach by Lisa Phillips

When one of their own is targeted the Secret Service Agents must protect her

Counting the days until she's officially an agent, Secret Service trainee Skylar Austin is blindsided when she's nearly killed during a training exercise at the White House. Veteran agent Grady Farrow recognises a dead–serious threat when he sees one. Someone is gunning for the pretty young rookie. But if they want to get to Skylar, they'll have to go through Grady first.