This will take a bit of an explanation, so bear with me.

   Around the turn of last century, a relatively well-known mystery writer named Lawrence L. Lynch had quite a few books published. Some of them were reprinted later as by Emma Murdoch Van Deventer, and as John Herrington says, “At some time someone was able to match Lynch to Van Deventer [as to being the real name of the author], the connection being lost in the mists of time.”

LAWRENCE L. LYNCH

   The only problem is, no one has been able to find a real person having Van Deventer’s name, including John, and he’s been looking. He says, in part, “There are a few Emma Van Deventers on Ancestry.com, but Murdoch does not feature as part of any of these names.”

   I’ll reprint all of Lynch’s entry in Crime Fiction IV, by Allen J. Hubin, just for completeness, but the actual request is, if you know or can come up with any information about either Lawrence L. Lynch or Emma Murdoch Vandeventer, please leave a comment or drop me a line.

LYNCH, LAWRENCE L.  Pseudonym of Emma Murdoch Van Deventer.   [Note: There seem to be no books that appeared under the latter’s name only.]   Except for two which apparently were never published in the US, these are the US titles only. All but one were reprinted in the UK by Ward Lock, including those as by Van Deventer, indicated by EMVD.

      Shadowed by Three (n.) Donnelly 1879 [Neil Bathurst; Frank Ferrars]
      The Diamond Coterie (n.) Connelley 1884 [Neil Bathurst]
      Madeline Payne, the Detective’s Daughter (n.) Loyd 1884 [Madeline Payne]    EMVD
      Dangerous Ground; or, The Rival Detectives (n.) Loyd 1885 [Van Vernet]
      Out of a Labyrinth (n.) Loyd 1885 [Neil Bathurst]
      A Mountain Mystery; or, The Outlaws of the Rockies (n.) Loyd 1886 [Van Vernet; U.S. West]
      The Lost Witness; or, The Mystery of Leah Paget (n.) Laird 1890 [New York City, NY]
      Moina; or, Against the Mighty (n.) Laird 1891 [Madeline Payne]

LAWRENCE L. LYNCH

      A Slender Clue; or, The Mystery of Mardi Gras (n.) Laird 1891    EMVD

LAWRENCE L. LYNCH

      A Dead Man’s Step (n.) Rand McNally 1893    EMVD
      Against Odds (n.) Rand McNally 1894 [Carl Masters; Chicago, IL]    EMVD

LAWRENCE L. LYNCH

      No Proof (n.) Rand McNally 1895 [Chicago, IL]    EMVD

LAWRENCE L. LYNCH

      The Last Stroke (n.) Laird 1896 [Frank Ferrars; Illinois]
      The Unseen Hand (n.) Laird 1898    EMVD
      High Stakes (n.) Laird 1899
      Under Fate’s Wheel (n.) Laird 1901    EMVD
      The Woman Who Dared (n.) Laird 1902
      The Danger Line (n.) Ward 1903 [New York City, NY]
      A Woman’s Tragedy; or, The Detective’s Task (n.) Ward 1904 [Carl Masters; Wyoming]
      The Doverfields’ Diamonds (n.) Laird 1906    EMVD
      Man and Master (n.) Laird 1908 [Carl Masters]
      A Sealed Verdict (n.) Long 1910 [Chicago, IL] No UK edition.
      A Blind Lead (n.) Laird 1912    EMVD

   Notes: Titles with links can be found as etexts online. [See the comments for a list of five more.]