My 11 year old son, a reluctant but good reader, just loves this series and rated it 5 stars. Four friends: Jake, Cyril, Lucas and Lexi find an abandoned warehouse full of spy equipment and computers in a local wooded area called Stoneship Woods. This book is the first in the Spy Gear Adventures series. Something strange is going on in the local "haunted house" and the friends use the warehouse full of great gadgets to investigate the mystery. The action is fast paced but clearly written and easy to follow. The author talks directly to the reader at times making whacky jokes and observations while relating the story. Lexi is a very strong female character, Cyril is the athletically challenged gadget whiz and the Bixby brothers have very strong positive family interactions. I won't spoil the mystery but I will say major questions about the origins of the warehouse remain open for future stories. Fun reading for tweens.