StructureAndInterpretationOfComputerPrograms
Behold the Wizard. His magic is LambdaCalculus.
Full Text Online at http://mitpress.mit.edu/sicp/full-text/book/book.html
Also have a look at the most excelent video Lectures that Abelson and Sussman have held: http://swiss.csail.mit.edu/classes/6.001/abelson-sussman-lectures/