While doing spring cleaning in her room, Jesse comes across a crayon on her window sill that is curiously bent over. She recalls that the crayon was there all winter and not bent at all. Jesse begins to wonder what caused the crayon to bend. Using science skills, Jesse discovers how the Sun is closest to Earth in summer and that's why the crayon melted.
A summer trip to her grandparents' house was going great until Jesse gets caught up in a mystery in the attic. When she encounters a pair of spooky green eyes during a lightning storm, Jesse sets out to use engineering skills to solve the Case of the Clicking Clock.
While playing in her tree house, Jesse is intrigued by a falling sycamore seed that slowly spins to the ground. But when she sees acorns falling fast directly down to the ground, she must solve the riddle while learning about propellers and windmills and using technology to understand aerodynamics.
