Botanist

Caustic pathologist Estelle Doyle has firearms discharge residue on her hands, and, in a house surrounded by fresh snow, hers are the only footprints going in. Shot twice in the head, her father's murder appears to be an open and shut case. Since her arrest she's only said three words: 'Tell Washington Poe.'

Meanwhile, a poisoner the press have dubbed the Botanist is sending high profile celebrities poems and pressed flowers. The killer seems to be able to walk through walls and, despite the advance notice he gives his victims, and regardless of the security measures the police take, he seems to be able to kill with impunity.

For a man who hates locked room mysteries, this is going to be the longest week of Washington Poe's life…