THRUSH steals a prototype of U.N.C.L.E.'s flawless lie detector, the Verac-B. U.N.C.L.E. manages to steal it back, and puts it on a plane with a courier. But that plane crashes under somewhat odd circumstances. Now THRUSH and U.N.C.L.E are both racing to recover the device. Both may run afoul of a tradition more ancient than either of them.