Plot devices are elements used in storytelling to create suspense, surprise, and intrigue. They are often used to move the plot forward and to keep the audience engaged. The two plot devices mentioned in the crossword solutions are HOES (4 letters) and TWISTS (6 letters). Hoes are a type of plot device that involve introducing a new element or character into the story, often with unexpected consequences. Twists are another type of plot device that involve a sudden change in the direction of the plot, often leading to a surprise ending.