It looks like you’re referencing the Spanish edition of Freida McFadden’s thriller , whose title translates to “La asistenta te vigila.” However, the title you wrote — La asistenta te vigila — is slightly different from the official Spanish title, which is usually La asistenta (published by Suma de Letras / Penguin Random House). The phrase “te vigila” (“watches you”) matches the English subtitle or tagline: “The Housemaid is watching.”