Gnarly (as in awesome) tale about the great whites lurking about the Farallon Islands 20 miles west of San Francisco. Casey gets hooked on the place after seeing a BBC documentary of the Shark Watch project in the 90s, and eventually obtains a permit to visit the island, meets with Peter and Scot (the bird/shark experts), and obsesses about learning more and becoming part of the crew. Peter decides she can rent a sailboat and be the water-born part of the shark expedition, mooring off the island (and thus not subject to all the rules and permits of the sanctuary). Lots of research went into this tale, diving into the history of the islands themselves (they used to have a school and small population, the Egg Wars, nuclear waste dumped nearby, etc.). But the true stars of the book are the sharks themselves, massive 15-20 foot monsters investigating the trailing decoy surfboards, spilling dark pools of seal blood into the sea, circling and creating awe wherever they appear.
The Farallons is one of the few places where great whites are known to congregate year after year (Sept thru November), and thus the perfect place to study the species. After a few years of tagging, GPS sensors were able to track where they went post-Farallons, and they discovered that sharks also congregate at a spot in the middle of the ocean, far from anything, and presumed to be hard-coded into their 400 million year old DNA as a mating ground.
Very enjoyable read– recommended!