Not the best of the series, but a worthy addition. It reads like one of the better-than-average episodes of the show.
Michael - as usual - is in trouble with the law over his delinquent past, this time in more hot water than ever: he's suspected of murdering his brutal stepfather. Sheriff Valenti is up to his neck as well, since - as usual - he knows who the old man's killer must have been: Nasedo, the now-deceased shapeshifting alien who watched over Michael and his equally alien friends. Valenti's covering-up has come to the attention of the man who took Valenti's job away from him, spotlighting the number of times Valenti has performed in like fashion in the past. In the meantime, Michael's fellow aliens, Max and Isabel, are hot on the trail of one of the gene-donors their alien parents abducted and used to create their human appearance and nature - a genetic scientist who is the spitting image of the alien kids' personal Judas (and mother of Max's son), Tess.
The real problem with this particular entry isn't a lack of knowledge of the show and its characters, but an overabundance of it. The authors plainly know all the multiple soap-opera ins and outs, and reference so many of them that a newcomer to the Roswell stories - or even someone only partly aware of them - will quickly become lost, if they're not careful. However, the characters are wonderfully written, and the action and the plot remain steady. Numerous delightful inside-joke touches are added, such as Isabel's noticing her hair style is similar to that of a nameless WB (the station that aired the show) actress, and Max and Isabel's personal song being the series' theme by Dido.
You could do better, but not much. Well worth reading. It will be more comprehensible to real series fans, but even if you're not, you can keep up with it - if you try.