First the evidence. On December 18, 2012, Anarchist12 posted a poem called "winterscape". Here is the poem with the line breaks omitted (emphasis is mine):
"draped in monochrome as far as spying eye black knives of fir thrust deep into the sky white snow lapping at roots when the first sun slid through the woods jumping leaping from tree to tree rock to rock like a spreading flame icy air and fathomless quiet the landscape surged into magic endless surging spurry-like color"And here is a passage from "The Secret Agent" by Francine Mathews. Again the emphasis is mine:
"She slipped away from Max...hoping the icy air and fathomless quiet would slap some sense into her skull. The world at this hour was monochrome: black knives of fir thrust deep into the sky, white snow lapping at their roots. When the first sun slid through the woods, jumping from tree to tree like a spreading flame, the landscape surged into color."The poem makes use of identical phrases from the novel. The relevant passage from the book can be seen here. Screen shots of both the plagiarized poem and the passage are here: