As the title says, Netflix's A Series of Unfortunate Events will end with Season 3, says producer Neil Patrick Harris to TV Guide.
Unfortunately this is considered news. Netflix had already renewed the show for a second and third season and the first season covered the first four books of the thirteen book series. Simple math suggested that the series would end with the third season.
The only way we should be surprised about the length of the series is if the producers decided to add an additional season or a spin-off to the show.
Be sure to check out our review for Season 2 of A Series of Unfortunate Events on April 3.