Blood Lance

Private investigator and former knight Crispin Guest faces his most complicated case yet when he witnesses a body fall from London bridge into the frigid River Thames. Though the man's death is declared a suicide, Guest sees evidence of foul play. His investigation leads him to Sir Thomas Saunfayl, an old acquaintance from his knighthood days. It seems the dead man was bargaining with Sir Thomas for the Spear of Longinus, the weapon used to pierce the side of Christ on the Cross, which grants invincibility to its owner.