OK, I'll review before I read others' opinions.
I really enjoyed a lot the first two chapters. I loved the setting up of the adventure story, and the whole Nick/ Gabe thing, with all the mystery surrounding the tutor. All the other characters (relatives, friends...) are really good. The dialogues flow easily, the general tone is light and playful, with all the hints and foreshadowing that make me want to read further.
The rescue in (and out) of the Mc Donald's is great. I have more trouble buying the whole sanctuary episode. I thought it was the final chapter (dumb me, I could have read it wasn't) so I was really eager to know the end. It's still as playful, but it seems to me to be dragging up a bit, with not many answers as to what this mysterious organization does. The whole "besotted with Martin" part is fun as a part, but from my POV it's a bit annoying plot-wise. It reminds me of the SAS series (fascist French spy novels from the 60s and 70s), in which the hero had three different women in every book.
So I'll certainly be eager to read chapter 5, because I like your characters, and your style is extremely entertaining. Oh, darn, I forgot to rate it as I read! I'll go back to give a 9 to chapter 1&2, an 8 to ch. 3 and a 7.5 to ch. 4! (Isn't it strange to consider a story chapter by chapter?)