Licence to Kill — John E. Gardner

Bond has lost his licence to kill. After taking revenge on the CIA agent who handed his friend over to Sanchez, a master criminal, M revoked his double 0 status and he's now considered a rogue agent.
With MI6 trying to bring him in and only the support of Q behind, him Bond goes after Sanchez.
Boarding his ship, Bond tricks his way into Sanchez's inner circle and discovers the secret of his wealth. But Bond is walking a dangerous tightrope and it is surely only a matter of time before he slips . . .
Licence to Kill is the ninth James Bond book by John Gardner, and a novelisation of the 1989 Eon Productions film of the same name.