"Quantum of Solace" is unusual among Bond films in that it was deliberately made as a sequel to "Casino Royale"; in the past there has been little continuity between one Bond film and another, with each being made as a self-contained adventure. (Some of the films, however, such as "The Spy who Loved Me", did make reference to Bond's late wife Tracy, who was killed at the end of "On Her Majesty's Secret Service"). In "Quantum of Solace" Bond's main motivation is grief at the death of his love Vesper Lynd, and desire for revenge.
Revenge is a dish best served with bullets, high explosives and giant rolling flameballs. In Quantum of Solace, James Bond orders the revenge buffet, deluxe.
We begin just after "Casino Royale," with Bond's girlfriend Vesper dead and her (other, missing) boyfriend suspected in forcing the events that led to her death, which was perhaps the first suicide by drowning in an elevator yet recorded on-screen.