+1 to Lost Echo, one of my favorite adventure games on ios. Also: Tiny Thief Tiny Space Adventure Gemini Rue
Theres the classics as well like Monkey Island, Beneath a Steel Sky etc I'm a big fan of 'Fester Mudd', a 'new' game but done as an homage to the old classic Lucasarts point n click games
Fetch is a little ahort, but very poignant, with some great interludes by way of in-game arcade games.
I second Gemini Rue and Fester Mudd, although the latter is an "Episode 1", but "Episode 2" is MIA. The Journey Down is well-rated and I particularly enjoyed Detective Grimoire.