Lucid Intervals, by Stuart Woods. Unabridged audio.
Stone Barrington and Dino are back to their old tricks, hanging out at Elaine's (I wonder if the real-life death of Elaine will be reflected in a future novel) and getting themselves and each other out of dangerous situations.
In this installment, Felicity from MI6 (and from Stone's past) arrives with an assignment for Stone -- find the whereabouts of a missing British turncoat agent. Felicity zeroes in on one candidate, who Stone befriends and comes to believe is not the turncoat. All the while, the annoying Herbie Fisher comes and goes, sometimes at fortutitious moments, and sometimes not. The light comic relief was fine, but the coincidental nature of one particular incident seemed a stretch.
As always, high adventure and danger and thrills. Enjoyable stuff.