“Siracusa” is filled with secrets

It’s hard to imagine a better beach read than Siracusa, the new novel from Delia Ephron. If this was a movie, which it surely will become, the pitch meeting would go, it’s The Vacationers, meets The Talented Mr. Ripley, meets Gone Girl.
Two couples, Lizzie and Michael; and Taylor and Finn, plus their 10-year-old, Snow, go on vacation together in Italy. Lizzie, a journalist who is struggling to find work and relevance, and Michael, a famous playwright who made a n