Old Scores by Will Thomas
My rating: 4 of 5 stars

1890 London and the new Japanese ambassador has arrived with his entourage. One of their schedule visits is to the gardens of Cyrus Barker. Later that night when Ambassador Toda is kiled , Barker who was in the vicinity is the prime suspect. But the new ambassador, General Mononobe, employs them to find the murderer.
A stand-alone story, and an enjoyable mystery with political intrigue, a bit of romance, and where we also find out more about Barkers' history.
A NetGalley Book

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