At my high school in California a couple of years ago we developed a unit based on _Flatland_ that involved all four core academic subjects -- in the english class they actually read the book and discussed literary and stylistic aspects. In the history class they discussed the allegory being made about social class and gender. In the math class they talked about the geometry, and in my science class we talked about the role of geometry in understanding physics and chemistry, and did exercises and problems that drove home that point. It helped that this high school had a strong core teacher team that collaborated daily on coordinating lessons and sharing notes on struggles our students were having -- so we were already focused on interdisciplinary work and helping the students make connections between different subjects.
I applaud what you are trying to do, and reccomend that whatever materials you choose, you try to coordinate some of them with the other teachers at your level -- it works!