Conrad Allen  (aka Edward Marston and Keith Miles) Not necessarily cozies.
DILLMAN Series:
Main Character: George Porter Dillman, Detective, Former Actor & Yacht Builder

1. Murder on the Lusitania     '99
2. Murder on the Mauretania     '00
3. Murder on the Minnesota     '02
4. Murder on the Caronia     '03
5. Murder on the Marmora     '04
6. Murder on the Salsette     '05
7. Murder on the Oceanic     '06
8. Murder on the Celtic   '07

Written as Keith Miles:
ALAN SAXON Series:
Main Character: Alan Saxon, Golfer

1. Bullet Hole     '86
2. Double Eagle     '87
3. Green Murder     '90
4. Flagstick     '91
5. Bermuda Grass     '02
6. Honolulu Play-Off    '04

MERLIN RICHARDS Series:
Main Character: Merlin Richards, Architect, 1920s, Phoenix

1. Murder in Perspective     '97
2. Saint’s Rest     '99
3. Bermuda Grass   '05

Written as Edward Marston:
ROBERT COLBECK Series:
Main Character: Robert Colbeck, Inspector, Scotland Yard, 1850s

1. The Railway Detective     '04
2. The Excursion Train     '05 
3. The Railway Viaduct     '06
4. The Iron Horse     '07

REDMAYNE & BALE Series:

1. The Frost Fair   '03
2. The Parliament House    '06
3. The Painted Lady    '07

ELIZABETHAN THEATER  Series:
Main Character: Nicholas Bracewell

1. The Queen’s Head    '88
2. The Merry Devils    '89
3. The Trip to Jerusalem    '90
4. The Nine Giants    '91
5. The Mad Courtesan    '92
6. The Silent Woman    '92
7. The Roaring Boy    '95
8. The Laughing Hangman    '96
9. The Fair Maid of Bohemia    '97
10. The Wanton Angel    '99
11. The Devil’s Apprentice    '01
12. The Bawdy Basket    '02
13. The Vagabond Clown    '03
14. The Counterfeit Crank    '04
15. The Malevolent Comedy     '05
16. The Princess of Denmark    '06 

DOMESDAY Series:
Main Characters: Ralph Delchard & Gervase Bret, Soldier & Lawyer (respectively), 1000s, England

1. The Wolves of Savernake     '93
2. The Ravens of Blackwater     '94
3. The Dragons of Archenfield    '95
4. The Lions of the North    '96
5. The Serpents of Harbledown    '96
6. The Stallions of Woodstock    '97
7. The Hawks of Delamere    '98
8. The Wildcats of Exeter    '98
9. The Foxes of Warwick    '99
10. The Owls of Gloucester    '00
11. The Elephants of Norwich   '00