In this study, the authors explore a newly constructed dynamic assessment (DA) intended to tap inference-making skills that they hypothesize will be predictive of future comprehension performance. The authors administered the test to 100 second-grade children using a dynamic format to consider the concurrent validity of the measure. The dynamic portion of the assessment comprised teaching children to be "reading detectives" by using textual clues to solve what was happening in the story. During the DA children listened to short passages and answered three inferential questions (i.e., one setting, two causal). If children were unable to answer a question, they were reminded what a reading detective would do and given a set of increasingly concrete prompts and clues to orient them to the relevant portion of text until they could answer the question correctly. Results showed that the DA correlated significantly with a standardized measure of reading comprehension and explained a small but significant amount of unique variance in reading comprehension above and beyond vocabulary and word identification skills. In addition, results suggest that DA may be better than the standardized measure of reading comprehension at identifying intraindividual differences in young children's reading abilities. (Contains 3 tables and 3 figures.)