There aren't a ton of text adventure game series around, let alone series in which each episode deals with the same setting and characters over time. "The Forest House" and its two sequels can make these claims, and what's cool is that they were written over two years (2007-2008) as entries in Ectocomp and The Odd Competition. Furthermore, each game was written in the space of three hours, with all this entails; smallness in the first place, and bare bones programming and bugginess in the second.
If you find low production values or the idea of more simple games intolerable, you should probably drive away now. On the other hand, if you're the kind of person who might be fascinated by the prospect of watching one fantasy/horror story being built up in three quick steps, the first being the author's first game, the third already demonstrating leaps of ambition (probably unmatched by execution… it was still written in three hours) then you may also be a bit charmed by the Forest House saga.
In the first game, The Forest House, you play a young boy who wants to sneak out into the forest at night to explore a house which no-one else can see, not waking your sister or parents in the process. The game presents just a handful of puzzles and evokes a decent atmosphere of childhood excitement.
This very short debut is ultimately the most technically polished of the three games, since it was given a revision makeover by its author after the original Ectocomp. Neither of the sequels have received similar treatment at this time of writing, and it is very important to point out that version 1 of the original The Forest House should be avoided -- bugs make it not-completeable, plus there are numerous other errors and missing descriptions. Version 2 (available from the ADRIFT website) is the one to play.
On its own, this game presents as an unspectacular but neat debut. It becomes more interesting when viewed as the first part of a story. Sequel "Return to the Forest House" offers more action and features the same protagonist, now five years older.