Hard Evidence by John Lescroart

The first evidence is found in the belly of a shark: a hand sporting a jade ring. The hand belongs to a Silicon Valley billionaire. When the rest of his bullet-ridden body washes up on shore, Dismas Hardy, assistant D.A., is suddenly plunged into San Francisco's murder trial of the century.
A Japanese call girl with a long list of bigshot johns is the defendant. But a series of bizarre twists and turns blows the case wide open, making Hardy himself a target for everyone from the victim's sexy daughter to the vengeful judge who wants Hardy to sizzle . . . .
"A gripping courtroom drama that may well be Lescroart's breakthrough novel . . . As always, Lescroart creates compelling, credible characters and holds the reader's attention through every step of the plot." -- Publishers Weekly
"A compelling combination of courtroom drama and whodunit . . . Sparked with crackling dialogue and vivid scenes of its San Francisco setting . . . Lescroart is a fine writer." -- Richmond Times-Dispatch