Will Thomas’s Barker and Llewelyn series in one one of Auntie M’s favorite historicals with good reason, as his research is meticulous and often based on real events. He returns with the newest in this long-running series with For Services Renderered.

It’s October of 1986, and Barker and Llewelyn, private enquiry agents, have a long established daily routine that is shaken to its very core when their cook, Etienne Dummolard, chef owner at Le Toison d’Or, fails to appear to cook their breakfast. When he is taking his family to Dijon to avoid clashing with his sworn enemy who ate dinner the previous night at his restaurant.

The news is particularly startling because Barker killed Seabastian Nightwine in a duel, yet Eitienne insists he’s alive.

Unfortunately, this turns out to be true. The evil man makes enemies easily and never forgets a grudge. He trained his only daughter to be an assassin, and is dangerous beyond compare as he runs through money and will do anything to earn more, even to kidnapping British citizens who have angered the Qing government years ago in China and still have a reward on their heads. Yet his charm amuses many, including the Prince of Wales, who has not seen his dark side.

So when Barker’s paramour, Lady Phillipa Ashleigh, visits to say she’s received a message from Nightwine, Barker is on instant alert. Coveting Barker’s relationship with Lady Phillipa makes Nightwine doubly treacherous. Soon she and Llewelyn’s wife and young daughter are on their way to Paris, out of harm’s way.

But not before a visitor to their office gives them another, possibly related, case. Dr. James Cantlie begs the two detectives to find his missing friend, a young doctor he mentored who has disappeared, named Sun Yat-Sen.

What follows is a double espionage situation with Nightwine at their heels as the men try to find the young kidnapped doctor, born in China but raised in Hawaii. Learning that the Qing government has declared a price on the man’s head for a letter he sent to the government complaining of their methods, Barker suspects Nightwine is at the heart of the man’s disappearance.

Their investigation will take the two men into the heart of the Cbinese embassy who are holding the young doctor, with Nightwine planning to smuggle him out of England to face execution in China. Only the wits and wiles of Barker and Llewelyn can stop this plan from coming to fruition.

Using Llewelyn as narrator adds an element of the Welshman’s pithy observations in this wholly entertaining novel.