A Spy Like Me by Kim Sherwood

An elite team of MI6 agents must go undercover to unravel a smuggling network funding violent terror in the second thrilling adventure in the acclaimed Double O series by Kim Sherwood.
James Bond is alive.
Or at least, he was when he left a clue at the black site where the insidious private military company Rattenfänger held him captive. MI6 cannot spare any more lives attempting to track down one missing agent-no exceptions, even for Bond. But Johanna Harwood, 003, has her own agenda. Sidelined by her superiors while she grieves the loss of a loved one, Harwood goes on an unsanctioned mission: to find 007. Meanwhile, MI6 has another problem...
A bomb has detonated in London.
Double O agents on the trail of the terrorists responsible acted quickly to prevent mass destruction and save lives. But MI6 failed to neutralize the nation's enemies before they could strike, and one of their own was seriously injured in the blast.
They won't fail again.
Assigned to root out the source of the terrorists' funding, Joseph Dryden, 004, and Conrad Harthrop-Vane, 000, enter the field. Tracing clues from Sotheby's auction house to Crete to Venice, they uncover a money laundering scheme involving diamonds, black market antiquities, and human trafficking. Once a major sale is made, a six-day countdown to the next terror attack begins. As the Double O's follow the twisting trail, they find themselves unexpectedly inching closer to Bond...