He beat his hand upon his breast, confessing: mea culpa.
There are no more uses of "mea culpa" in the book.
Show samples from other sources
Oh, he’d seen the angry one the other night and the mea culpa one just a little while ago, but he had no idea how she behaved under ordinary circumstances.
Nicholas Sparks -- The Choice
At the time I arrived, for example, the two most prominent writers being promoted were a retired World War II fleet admiral and an exceptionally flyblown ex-Communist stool pigeon whose ghostwritten mea culpa was doing middling well on the best-seller lists.