Henry, Jessie, Violet, and Benny are spending a week on a houseboat! Throughout the journey, the children have the feeling they are being watched--and they are. Someone wants something that's hidden on their boat, and they'll stop at nothing to get it.

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

"Siblings Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. What secrets will the children find on their very own island?"--

A family starts out on a one-day mountain climbing excursion that becomes very exciting. In fact, it becomes an adventure for the former "boxcar" family. They unearth some mysteries and have a fine time in the process.

"When a diphtheria epidemic hits her 1840 village, thirteen-year-old Jessie discovers it is actually a 1996 tourist site under unseen observation by heartless scientists, and it's up to Jessie to escape the village and save the lives of the dying children"--

"The Aldens visit their old friends, the Piccolos, at their pizzeria. When they learn the restaurant isn't doing well, they offer to help. But the oven doesn't work, the electricity shuts off, and then someone hands out fake coupons! Who wants to shut down the Piccolos' Pizzeria?"--Back cover. When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind...

To Sherlock Holmes she is always THE woman. I have seldom heard him mention her under any other name. In his eyes she eclipses and predominates the whole of her sex. It was not that he felt any emotion akin to love for Irene Adler. All emotions, and that one particularly, were abhorrent to his cold, precise but admirably balanced mind. He was, I take it, the most perfect reasoning and observing machine that the world has seen, but as a lover he would...

After the Alden siblings visit their Great-Aunt Jane's ranch in a mining town, there is a mysterious fire which damages three houses, but Benny's friend Mike notices a strange man in a blue hat in the paper and Mike and Benny suspect he may be the culprit.

"The Alden children are helping their new neighbors build a tree house when they discover an attic window that not even their neighbors knew about"--Title verso page.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.