Murder at Battle Rock Lighthouse. Lowan, #19

Meet Lowan, a telepathic alien working as a private detective in the 1930s!When the Battle Rock Lighthouse keeper's body is found at the bottom of a staircase and Captain Milford's historic ship's bell goes missing, Lowan and Marx are drawn into a current of danger and lies. From the lantern room to a hidden sea cave where smugglers stash crates, they race to identify who swapped a priceless relic for a forgery, who would murder to hide the swap, and whether a desperate assistant keeper has deeper secrets.
Lowan and Marx must untie a knot of smuggling, forgery, and murder before the tide seals the case. With the tide and time working against them, every ledge they climb and every door they open reveals a new complication-until a desperate struggle in the lantern room forces Lowan to fight not just for the truth, but for his life. This novel sits at the intersection of atmospheric maritime noir and procedural mystery: a locally-rooted crime about a forged relic whose fallout exposes smuggling, academic vengeance, and a willingness to kill for reputation-and the reader only gets the full answer after they follow Lowan and Marx to the lantern room and beyond.
S. E. Grosskopf's writing is strongly influenced by the old pulp fiction magazines and Golden Age radio dramas of the 1930s-1950s. If you like fast-paced action and mystery with a dash of urban fantasy and quirkiness, then you'll love these books. This is the nineteenth book in the series. The books follow chronologically. Reading them in order is recommended.