Jen from Dark Diva Reviews says:
Mask by Jan Irving is a book with a very unique twist to storytelling. I have never read a book that utilized instant messaging as a technique to get into the personalities of the characters. I have to admit, it was a little odd at first, but I really grew to love it. The quick banter was fascinating and revealing as to Nick and Kain’s personalities. The way in which Jan Irving allowed the characters to have a security in the instant messaging that they didn’t have face to face really came through for me. Not only did this lead to interesting character dimensionality, it also allowed the reader to feel Nick and Kain’s insecurities in a way that I really didn’t think would be possible without this technique.
More of this review here.