Just Call My Name by Holly Goldberg Sloan

Emily Bell has it all. She’s in love with a boy named Sam Border, and his little brother has become part of her family. This summer is destined to be the best time of their lives–until a charismatic new girl in town sets her sights on Sam. Now Emily finds herself questioning the loyalty of the person she thought she could trust most.

But the biggest threat to her happiness is someone she never saw coming. Sam’s criminally insane father, whom everyone thought they’d finally left behind, is planning a jailbreak. And he knows exactly where to find Emily and his sons when he escapes…and takes his revenge.