Book Reports / Thesis Help - Literary Criticism essay Frankenstein [6]

I'm really having trouble with thesis statements, I'm more of a creative writer than a critical one, so this whole argument concept kind of eludes me. At this point I've narrowed my paper down to two ideas but am having trouble coming up with a good thesis statement - though I know the basis of what I want to argue, just not how to put it properly into words.

I'm likely going to go with the theme of abandonment, because I think it's easier to sum up in 2.5 pages than the other topic I was going to choose, but how can I make this a really tight concise thesis statement? I want to say something like:

One of the main and recurrent themes in mary shelley's novel frankenstein, is abandonment. One can see that the parallels between the novel and mary shelley's own life are quite similar. (And then maybe insert a quote here as my hook or whatever.)

Any help is appreciated