Jefferson Davis and the Conspiracy

[wpbinzel]

Other than the May 8, 1863 telegram that I referenced above and the Dahlgren affair, are there any other credible accounts of Union plots or attempts to capture (or kill) Jefferson Davis?

(I am aware of the 1998 book, The 1862 Plot to Kidnap Jefferson Davis by Victor Vifquain. The editors of the book pass it off a "a true tale ... reconstructed novelistically," but I view it as fiction and not credible history.)