The Gold Star Line, first published in 1899, is a collection of six stories written in collaboration by L.T. Meade and Robert Eustace. Their names appear together on the title page, though only Meade's name appears on the front cover and the spine.I don't know if the book ever had a dust jacket. My copy is one that I managed to acquire from a dealer, and its great point of interest is that it has the Detection Club bookplate, and a label pasted into it indicating that Eustace presented it to the Club's library in October 1933. (The library was auctioned off years ago, before I was involved with the Club.)
So Eustace was evidently pleased to be associated with the book, and I'm as sure as I can be that his role was as ideas man. There are at least two stories in the book which have plots turning on points involving medical or scientific expertise, and it's a safe assumption that these were contributed by Eustace. I'd imagine that Meade did all the writing; she was a big name in her day, and a prolific and versatile novelist.
The stories are all narrated by George Conway, purser employed by the Gold Star Line. Conway recounts a series of adventures in which he played a part; much, but by no means all, of the action takes place either on board ship or while the ship has landed somewhere in the course of a voyage. The range of international locations gives the book a cosmopolitan feel, which would have been a good selling point at the time.
Conway is a likeable fellow, but we learn very little about his personal life. For Meade and Eustace, the action is the thing. I found the stories agreeable light (very light) entertainment, and the scientific plot twists in "The Rice-Paper Chart" and "The Yellow Flag" were quite clever. They offer a pleasing glimpse into a vanished world, as well as an example of lively crime fiction at the end of the nineteenth century. Eustace would, of course, go on to further collaborative success more than twenty years later, on that famous short story "The Tea Leaf" (with Edgar Jepson) and on The Documents in the Case with Dorothy L. Sayers.