​He has one rule: protect her 24/7 and keep his distance. ​Frank Castle is mature, cold, and disciplined to a fault-the family's most trusted bodyguard, an unshakeable presence. She is stubborn, defiant, and determined to test his every limit. ​By day, their relationship is strictly professional. But once the lights go out, forced proximity and heavy silences begin to chip away at Frank's iron restraint. ​Some lines should never be crossed. Especially after hours.