This book seems to suffer from a sharp drop in quality compared to the first two -- very odd, considering that it appears to be the same creative team! 
 The first two collections of The Batman Strikes, Crime Time and In Darkest Knight, are both manga-sized and slender; they collect five issues each. This collection, Duty Calls, is a trade paperback collecting seven issues, and it seems like the "usual" size for a comic book trade paperback. I don't know what size the individual issues were printed -- if they were originally manga-sized, perhaps that would explain why the art is so bad! 
 And the art is unfortunately bad, here. For example, in the first story, "Man of Service", I found Alfred unrecognizable on the first page, and had to go back and re-read it once Bruce entered and it was clear that yes, this was Alfred Pennyworth. Then, a few pages later, Bruce's two eyes point in two distinct directions in the middle of a conversation. A few pages after that, Bruce Wayne and Ellen Yin appear to have faces drawn at two different scales, or possibly by two different artists, despite facing each other in the same panel. I'm picking out the worst examples; some of the art was decent. None of it struck me as particularly nice, though. Despite having the same penciller, inker, and colorist, the first two volumes look much prettier. I'm looking at these side by side, and I'm reasonably certain that they were originally printed at the same size, and either Crime Time and In Darkest Knight were shrunk or Duty Calls was blown up. It's a shame! 
 As for the stories themselves, they were still quite good. There are seven issues collected here but really only six storylines, as "Prowler" and "Sands of Time" are a two-parter featuring Catwoman, Clayface, and Detective Yin. Detective Yin is actually a big deal in most of these stories -- she appears in every story except "Hit and Run" and "The Greenhouse Effect" and is a smart, capable player. (I especially loved her concern when the Riddler threatened to expose Batman in "A Question of Identity". Except for the two-parter, the stories don't flow together much plot-wise; the common elements are always the people: Bruce, Alfred, Yin, mob boss Mr. Thorne, Clayface, and the familiar faces of the Arkham crowd. 
 The last story, "The Greenhouse Effect", was something of a departure from the others. While the first five stories were set during the first two seasons of the television show, this last one jumps ahead to the third season and a radical change of cast -- this is the only story featuring Jim and Barbara Gordon, despite the cover of the collection placing Batgirl so prominently. It's a wonderful follow-on from the episode "Batgirl Begins" and the relationship between Barbara and Pamela Isley which was built there, but might be jarring and confusing for readers not also watching the show. 
 Okay, I also have to ask -- who decided that the right way to refer to Batgirl was The Girl Wonder? Seriously? Especially when Batgirl is a teenaged gymnast with a purple costume who fights crime even when Batman insists that she should give it up and go home? (For those of you who don't get the reference: in regular comics continuity "The Girl Wonder" was the fourth Robin, the first girl to be Robin, who got her start in crime-fighting as a gymnast who donned a purple costume against Batman's wishes.) 
 All of that said, I did enjoy this collection and I'm disappointed that the rest of the The Batman Strikes run apparently won't be collected in book format.