When I bought Shadowmagic ($0.99 as I write this review), by John Lenahan, in October '09, I paid $3.40 and considered it a good bargain. At the current sale prices, you should grab this one, fast.
When I saw the sequel was out, I pulled out the first volume and read it thru in just three days (in between doing everything else). The paper edition says it is 288 pages, but they go by in a flash (unlike Lord of the Rings, which the synopsis compares it to). This is young adult fiction, but is entirely enjoyable by adults of any age; there is budding romance (but barely a kiss or two) and the story is told from the point of view of a teenage boy, who is getting ready to go to school, trying to find a good time to ask his dad for a bit more cash to take out a girl, when he answers the door ... only to have people on horseback try to kill him, a weird glow surround him and one of the attackers crumble to dust upon being unhorsed. His day only gets worse, but he quickly adapts to his new surroundings, after breaking free of his captors and finding himself not in the Real World, at all.
The action isn't non-stop (really, could anyone stand to read 200+ pages that were?), as, in addition to a bit of adventure, you get his reaction to the new land, descriptions of what he sees and finds and experiences, as he makes his way. Along that way, he first reacts without thinking, but gradually changes to reaction with forethought (well, as much as a teen can muster, at any rate), growing at least metaphorically during journey. As with most good teen fiction, good triumphs over evil, in the end (at least for the day), but there is also tragedy to provide a bittersweet tinge to the joy of the day.
At the end, you can see the hooks for a sequel are set, but the volume concludes well on it's own (no big cliffhangers to frustrate you if you do decide not to get the second title). For myself, though, I've put the sequel near the top of my TBR list.