"First published in Great Britain by Macmillan Children's Books, 2013"--Copyright page.

In his sixth adventure, something sinister is afoot in the house in the west of Ireland in which young Sherlock is staying.

''Teen Sherlock battles a monstrous adversary on a mission to Ireland with his brilliant brother, Mycroft. Young Sherlock is thrown into a tangled web involving a spiritualist whose powers have attracted the attention of governments around the world. At the castle where the medium is demonstrating his "gift," Sherlock finds a household in turmoil. Servants and some of the guests are frightened but who--or what?--has terrified them so much that nobody will speak out? Young Sherlock must bring all his powers of deduction to bear in unraveling his greatest mystery yet.''--,provided by amazon.