Micah Erlich hires Holmes to solve urgently the robbery of diamonds in David Batonvert's Manhatten exchange from his world-reputed security firm's top-range vault model, the 'impregnable' Leviathan, before the news wrecks the manufacturer. Both men remember it was actually cracked once four years ago by a brilliant team of four, tried and jailed, but draw different conclusions concerning a connection, which Holmes has to revise while his investigation progresses with the help of his own consultants. Meanwhile he helps Watson deal with her unexpectedly visiting family rather then cancel her buddy job with him.
A modern take on the cases of Sherlock Holmes, with the detective now living in New York City.