SQL tracing in Oracle

I am trying to monitor SQL requests made to my Oracle DB
I can use SQL trace and it gives me the basic SQL request sent in
and the stats on it. But the information is not detailed enough, the
log shows a "select" request returning zero rows but the "where" contains
variables and not the actual match requested. Does anybody know a way
of getting the exact SQL request with all its parameters displayed or
does anybody know of another app that can do this. The application/client
I am trying to monitor has no source so this is the only way to see
what is happening, and why it returns zero rows.
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