Mystery series for Regency romance readers

Lovers of Regency romances who want a little extra "umph" in their stories should check out a mystery series featuring Sebastian St. Cyr, by C.S. Harris. St. Cyr is a veteran of the Napoleonic Wars, ex-spy and nobleman (Viscount Devlin), an unusual sleuth who originally enters the detection world as a suspect in the murder of a famous actress. Donning various disguises, he is able to move from the drawing rooms of high society to the dreadful slums of London in his quest to clear his name. He relies on help from his war-time friend, Irish doctor Paul Gibson, who provides CSI-type evidence, 19th-century style. Additional returning characters include his lover, actress Kat Boleyn; Tom, a young boy St. Cyr rescues from the harsh life of the streets, and various family members. The books should be read in order, as the characters are introduced in book 1 and appear in subsequent volumes: What Angels Fear (2005) - When Gods Die (2006) - Why Mermaids Sing (2007).