When hikers find the body of a beautiful young girl on the banks of the Potomac River, Detective Amanda Steele is shaken and confused. What is the significance of the delicate flower resting on the girl’s torso? A sign of affection, or a twisted killer’s calling card?

The girl is Chloe Somner, a local nineteen-year-old ecology student well-known to the park rangers and loved by all her classmates. Searching Chloe’s home, Amanda can’t work out who could have tempted her to the water in the early hours of the morning, but a long night hunting through cold cases gives her a possible lead: twenty years ago another local girl was murdered, a red rose left on her body. But why would this killer strike again now?

Focused on the past, the last thing Amanda expects is the news that Chloe’s roommate has been found dead, another black orchid left. Terrified that more innocent victims will follow, can Amanda uncover the significance of the flowers and stop this cold-hearted killer before he returns for the next orchid girl…?