Having returned home from his grandfather's house, Alex is back to cooking, cleaning, and making sure his lazy sister is doing her homework. Of course, he and Gabrielle are still inventing—much to the consternation of everyone who knows them. But when Alex decides to take a mysterious young woman into his home, he may discover that kindness and heroism don't always go hand in hand.

What's a wannabe hero to do when life throws such an adorable assassin at you?