Grimwood explored his fascination with cetacean intelligence, encounters with dolphins and research into intraspecies dolphin communication for his novel Into the Deep (William Morrow, 1995). It is about a marine biologist struggling to crack the code of dolphin intelligence. It features lengthy passages written from the point of view of several dolphin characters. To research "the willful denial and gratuitous cruelty" involved in tuna fishing, Grimwood secretly infiltrated the crew of a tuna boat based in San Diego, California.
