The Whitby Witches Series by Robin Jarvis

At first glance, the small seaside town of Whitby seems quiet and charming, but eight year-old Ben and his older sister Jennet soon learn that things are not always as they seem. Moved about from foster home to foster home, Ben and Jennet hope to make a fresh start in Whitby. But Ben sees things and people others cannot. There's something unusual about Alice Boston, their new guardian. And what is that horrible howling Jennet hears late at night? Something wicked's brewing in Whitby... moreAt first glance, the small seaside town of Whitby seems quiet and charming, but eight year-old Ben and his older sister Jennet soon learn that things are not always as they seem. Moved about from foster home to foster home, Ben and Jennet hope to make a fresh start in Whitby. But Ben sees things and people others cannot. There's something unusual about Alice Boston, their new guardian. And what is that horrible howling Jennet hears late at night? Something wicked's brewing in Whitby. Can Ben and Jennet put it to rest? less

One cold November night, high on Whitby's abbey plain, a scale-covered claw burrows out of the earth, and into the pale moonlight a hideous creature worms its way...As the morning train stops at Whitby station a mysterious man alights, and looks about him with keen interest...On Whitby beach, Nelda the aufwader waits, her heart filled with the dread that a terrible doom is about to overcome her people.. moreOne cold November night, high on Whitby's abbey plain, a scale-covered claw burrows out of the earth, and into the pale moonlight a hideous creature worms its way...As the morning train stops at Whitby station a mysterious man alights, and looks about him with keen interest...On Whitby beach, Nelda the aufwader waits, her heart filled with the dread that a terrible doom is about to overcome her people...In this second griping book in the Whitby series, Miss Boston, Jennet and Ben are pitted against a new and even more deadly enemy - but can they succeed a second time? less

In the depth of the night, a dark shape rises from Whitby's harbour and crawls along the deserted streets, leaving a trail of slime in it's wake. As Ben murmurs fitfully in his sleep, two glittering clusters of eyes stare keenly at the sleeping boy...Along the windswept Whitby shore, Nelda the aufwader nurses a terrible secret. It is only a question of time before she must reveal the truth.. moreIn the depth of the night, a dark shape rises from Whitby's harbour and crawls along the deserted streets, leaving a trail of slime in it's wake. As Ben murmurs fitfully in his sleep, two glittering clusters of eyes stare keenly at the sleeping boy...Along the windswept Whitby shore, Nelda the aufwader nurses a terrible secret. It is only a question of time before she must reveal the truth...As Alice Boston lies paralysed by illness in her Whitby home, the ghost of a long-dead friend appears before her to warn of a great and impending danger...This is the third enthralling book in the Whitby series. less