Book four in the Uniform Behaviour SeriesA singing messenger heats up Valentine's Day for a lonely park ranger.Aeryn Saunders is working her way through college as a singing messenger for the Hearts of Extinction message delivery service. She gets the sad job of warbling a Valentine's Day kiss-off notice to a lonely park ranger.Race Donnigan is prepared when his one-time socialite girlfriend dumps him. Then he finds that there's compensation in the form of a sweet singing messenger.