The Faithful Couple -- A. D. Miller

The story of a friendship built on a shared guilt and a secret betrayal, The Faithful Couple follows Neil and Adam across two decades, through girlfriends and wives, success and failure, children and bereavements, as power and remorse ebb between them.

Their bifurcating fates offer an oblique portrait of London in the boom-to-bust era of the nineties and noughties, with its instant fortunes and thwarted idealism.

California binds them together, until-when the full truth of what happened emerges, bringing recriminations and revenge-it threatens to drive them apart.