A widow is beaten by an intruder in her home; a teenage boy steals trifles from a neighbor's garage; counterfeit 20s are floating around town; a teenage ""wolfpack"" is vandalizing homes; an auto body shop revamps stolen cars; a bloody shooting is staged on a fishing boat; and twelve-year-old Angie, who eventually noses out or stumbles upon the connections among all these events, is followed by a sinister man in tan. As school lets out for summer, Angle determines to catch the wolfpack for the glory of her older sister Kit, a police officer. Kit's chief interest, however, is in the counterfeiters. With just a little help from Jess, a boy her age, and a bit at the end from Kit, the dauntless Angle manages to round up the whole shebang. Meanwhile of course there are frightening brushes with the culprits, climaxed by overnight imprisonment with a vicious guard dog stationed between Angle and Jess and freedom. There's nothing more to the story than the tooneatly interlocked plot--an acceptable limitation in Sobol's Encyclopedia Brown puzzle-stories, but more noticeable here, where one story (albeit three cases deep) is stretched out to fill the volume. However, for addicts of straight detection Sobol keeps the curve balls flying; and the calculated appeal to feminists will give Angie a push.