The leaders of the free world descend on Scotland for an international conference, and every cop in the country is needed for front-line duty - except one. John Rebus' reputation precedes him, and his bosses don't want him anywhere near Presidents Bush and Putin, which explains why he's manning an abandoned police station when a call comes in.

During a preconference dinner at Edinburgh Castle, a delegate has fallen to his death. Accident, suicide, or something altogether more sinister? And is it linked to a grisly find close to the site of the gathering? Are the world's most powerful men at risk from a killer? While the government and secret services attempt to hush the whole thing up, Rebus knows he has only 72 hours to find the answers.