Testing members' knowledge:
in which adventure does ACD introduce a rival sleuth, the only adventure in
which the villain comes to Holmes for help?
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http://geo.yahoo.com/serv?s=97490481/grpId=5894845/grpspId=1720019661/msgId
=2370/stime=1188890342/nc1=4096940/nc2=4026935/nc3=3>
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