No Baby But Mine (Lovers Under Cover #1) (Harlequin Intrigue #538)

For single mother Kirsten McCourt, small-town life changed instantly the night she overheard - on her baby monitor! - thugs ordering a hit. But she could never imagine the undercover cop on the case would be the man with whom she'd shared one night of soul-searing passion - and a son... a son she'd kept secret from the man she'd never stopped loving.