is at its best when it spends most of its energy building the sibling bond between the assertive Bea and her meek, fragile sister Jessie, who’s discovering an emerging power that will become critical in their battle with evil. Bea’s antagonistic engagements with a hostile Dr. Watson, who’s clearly keeping many of the season’s answers close to his vest, also adds to the pro column. Bea’s initial forays into the cliché young adult love triangle with Billy and aristocrat-in-disguise Leopold (Harrison Osterfield) induces yawns. Leopold’s entire storyline reads more plot device than fleshed-out character; he exists to add to Bea’s conflicts and serve as a hindrance or help in the mystery-solving, depending on the need. Many character traits set up early in the season wind up forgotten or adding little to their respective arcs by the finale.