1644, and Civil War rages across England. Oliver Cromwell has taken charge of the opposition to King Charles the First and Cromwell's New Model Army is gaining victories. England is in chaos. Cromwell is a puritan who has vowed to wipe out evil and sorcery, aligning it with the King's Court. The young Witchfinder Matthew Hopkins is scouring the land, holding trials and burning at the stake anybody who he considers in league with the powers of darkness or are "freaks against nature, born of the Devil". Rumours are that there is an island of riches which will fund the escape of those using magic and anybody who stands by them. The island of "Sirenswail". It is to here that adventurers will set sail.

Three adventures in one, city, sea, and island, "Sirenswail" contains mature content and is suggested for OSR games including Lamentations of the Flame Princess. It is intended for 5-8 characters of levels 1-3.