Mark Eli Kalderon's "Fictionalism in Metaphysics" leaves much to be desired, especially in the way of fictionalist accounts of modality, where fictionalism is a prominent and attractive option. The one paper written on fictionalism in modality (Seahwa Kim) is adequate only insofar as a counter argument to the so-called "modal objection" to modal fictionalism, but is inadequate to the extent that it offers little insight into the myriad of problems with modal fictionalism, especially that of Gideon Rosen's (1990) "strong" (as opposed to "timid") modal fictionalism.
For those interested in fictionalism be warned that this volume is far from a comprehensive introduction to the subject, and leaves much to be desired as far as fictionalist accounts of modality are concerned. I would still recommend this volume as it does contain some intriguing pieces (Yablo's "Myth of Seven" and Dorr's piece on metaontology stand out). It might be useful to supplement this volume with R.M. Sainsbury's (2009)Fiction and Fictionalism (New Problems of Philosophy)