Wikipedia page about this book: https://eo.wikipedia.org/wiki/Stranga_Hereda%C4%B5o

Release date is 2017-11-13

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"Stranga heredaĵo: Romano originale verkita" by Heinrich August Luyken is a novel published in 1922. Young Esperantist Leonard Marston must fulfill his dying father's oath to secretly protect the Vincent children from life's dangers. When Delfino Haverford begins a cunning revenge against her half-brother's family through drugs and spiritualist manipulation, Leonard races to save them. His investigation leads him to Mexico, where a supposedly dead man holds the key to understanding the dark forces threatening those he promised to protect. (This is an automatically generated summary.)

Original publication data not identified