In this penultimate part of the Lord's Legacy series, Philip Lord, Gideon Fox and Danny Bristow take a break from fighting the civil war to investigate a locked room murder mystery at the Mortlake Tapestry Works which was formerly the home of the real life controversial figure John Dee - the alchemist of the title. Although he is dead long before the year 1643, when this story is set, his 'plot' lives on through the complex secret passages and stairs, rods and levers, to be discovered in his old home. Apart from occasional trips to London (the trio of protagonists, all Royalists, are deeply undercover) the story takes place mainly in and around the tapestry works, a site Lord needs to investigate to discover information about his mysterious antecedents and also to clear his name from calumny and an old attainder. I had one reservation about plotting to do with Lord's ability to adopt two identities whilst appearing to the same on successive days, and changing his apparent identity purely through disguise - this is the only in this entire series that I have questioned the plot logic. Apart from that, we have the same very entertaining ride as before, possibly with a little more humour because we have more of Lord and less of Nick Tempest and Maggs (though the latter's one appearance is without doubt memorable.) All very enjoyable.