Yes, buy the Camel (which, as a fringe benefit, offers a good many insights into programming logic if one reads thoughtfully). And while you're at it, go also for "Regular Expressions Pocket Reference" (also O'Reilly), which will team up nicely with the regex intro in "Learning Perl."

Re "programming logic:" Newcomers here are often advised to sketch out the steps to a solution to their then-current puzzles with pencil, paper and ordinary language. Doing so may be more useful to you than any book you can swallow in a week. So, perhaps you'd do well to divide your week between reading the Camel and writing plain-English (or your own preferred tongue), step-by-step synopses of some problems that intrigue you. (This assumes that in the course of your "few months" "studying Perl" you've come to some understanding of the concepts behind if (...) {...}, for, while and the like.

Update, 20081114: Fixed spelling of "fringe." Duh!