iFreeware

A Novel Idea is the premier tool for plotting your story and recording bursts of inspiration. Use its simple interface to create your characters, locations, scenes, and novels and then link them together to create your story's plot. Use the Idea feature to quickly jot down your creative sparks, snap pictures and link them to your story elements. Arrange your scenes by dragging and dropping them into place. Add scene goals and objectives for each character. Plus more!

Items that can be edited include:

Novel – title, setting, theme, tone, point of view, premise, and plot.
Scene – title, act, time, plot type, description, tension level
Character – name, age, external conflict, external motivation, internal conflict, internal motivation, description
Location – name, description
Idea – description, photo(s)

Pro Version, available as an in-app purchase, adds the following:
Dropbox Syncing
Sync between devices
Scene writing
Word count
Export to iTunes
Email export

Reviews:

"If you’re writing a novel, story, or play—or even a creative essay for school—this will definitely get the juices stirring and help organize your ideas." -- Appadvice.com