Sam and Simon find themselves in more trouble than they can handle when they decide to investigate a fancy car they spot driving around their school.

Escaping from Germany's Colditz Castle where he was being held as a prisoner of war, Captain Jack Cray fights his way to Berlin in April 1945, following a twisted trail of terror across Germany. The American Army commando has just been handed the most dangerous mission of his career--the assassination of Adolf Hitler.

An older boy dares Sam and Simon to meet him and his friends inside the graveyard on Halloween night.

Sam and Simon are off on a spring break vacation, with a crime to solve: someone has stolen four giant turtles.

Underneath the city of Springfield, Missouri, in the caves and tunnels around downtown, lives a dark community all its own. And as Detective Booger McClain discovers: above ground isn’t much different. As McClain searches for answers in a famous local homicide case, he and his wife, Rose, run straight into his old nemesis, The Order, a secretive group of wealthy men who hold tremendous power and influence. And this time, The Order is hellbent on destroying the nosy Ozarks’ detective for good before he learns too much. Will what’s hidden in the darkness stay hidden? Will the light of truth win out in the end? When even good friends are foes, who can Booger turn to? Luckily, McClain has an ace up his sleeve. Nobody messes with Rose’s man.

Sam and Simon must clear their names and find the real thief when they are accused of stealing toys from the donation box while they work as Santa's elves.

Hunting by moonlight, the unique vampire bat is the only known mammal in the world that feeds exclusively on blood! How do these Central and South American bats feed, communicate, reproduce, and roost? Full-page photos share the lives of these nocturnal creatures. Fun facts showcase the vampire bat?s unique adaptations and Words to Know introduce readers to new vocabulary.

This open-access book empowers its readers to explore the acoustic world of animals. By listening to the sounds of nature, we can study animal behavior, distribution, and demographics; their habitat characteristics and needs; and the effects of noise. Sound recording is an efficient and affordable tool, independent of daylight and weather; and recorders may be left in place for many months at a time, continuously collecting data on animals and their environment. This book builds the skills and knowledge necessary to collect and interpret acoustic data from terrestrial and marine environments. Beginning with a history of sound recording, the chapters provide an overview of off-the-shelf recording equipment and analysis tools (including automated signal detectors and statistical methods); audiometric methods; acoustic terminology, quantities, and units; sound propagation in air and under water; soundscapes of terrestrial and marine habitats; animal acoustic and vibrational communication; echolocation; and the effects of noise. This book will be useful to students and researchers of animal ecology who wish to add acoustics to their toolbox, as well as to environmental managers in industry and government.

Cave investigation is one of the most interesting research field in natural and earth sciences, showing a rapid development with technological progress. It coincides with a number of scientific disciplines to address the early human histrory, habitats of living lives and specimens. This book will be useful to students and researchers as well as to earth scientists, archeologist, biologist, natural sciences, and other experts in a other related of disciplines. The volume consists of three sections sorted thematically, each focusing on a certain aspect. The book presents results on the determination and definition of caves discussed by means of geographic, geophysical, and geological applications. Geomorphometric analysis using GIS and laser scanning, the importance of electric tomography method in cave detection, the use of groundwater sources in agricultural areas, and the habitats of bats and species are studied on several cave studies.