There are 3 books in the Night's Masque series. The newest book is The Prince of Lies which came out in 2013.

1
The Alchemist of Souls

Book cover of The Alchemist of Souls
When Tudor explorers returned from the New World, they brought back a name out of half-forgotten Viking legend: skraylings. Red-sailed ships followed in the explorers' wake, bringing Native American goods--and a skrayling ambassador--to London. But what do these seemingly magical beings really want in Elizabeth I's capital?

Mal Catlyn, a…
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2
The Merchant of Dreams

Book cover of The Merchant of Dreams
Exiled from the court of Queen Elizabeth for accusing a powerful nobleman of treason, swordsman-turned-spy Mal Catlyn has been living in France with his young valet Coby Hendricks for the past year.

But Mal harbours a darker secret: he and his twin brother share a soul that once belonged to…

3
The Prince of Lies

Book cover of The Prince of Lies
Elizabethan spy Mal Catlyn has everything he ever wanted - his twin brother Sandy restored to health, his family estate reclaimed and a son to inherit it - but his work is far from over. The renegade skraylings, the guisers, are still plotting - their leader, Jathekkil, has reincarnated as…